UPSC Syllabus 2027: Detailed Prelims & Mains Curriculum Breakdown
The complete paper-by-paper curriculum guide for the UPSC Civil Services Examination 2027 (IAS, IPS, IFS). Includes exhaustive micro-topics for Prelims (GS 1 & CSAT), Mains (GS 1–4, Essay, 26 Optionals), marking scheme & negative deduction rules, and the statutory 2027 examination timetable.
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UPSC Prelims Negative Marking & Score Simulator
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UPSC Prelims Syllabus 2027 (Objective Stage • 400 Marks)
General Studies (GS 1)
Core Syllabus Units:
- Current Events: National and international current affairs across politics, economy, summits, and science.
- History of India & Indian National Movement: Ancient, Medieval, and Modern Indian History with emphasis on socio-religious reforms and freedom struggle.
- Indian & World Geography: Physical, Social, and Economic Geography of India and the World, drainage systems, climate, and resources.
- Indian Polity & Governance: Constitution, Political System, Panchayati Raj, Public Policy, Fundamental Rights, and Statutory Bodies.
- Economic & Social Development: Sustainable Development, Poverty Alleviation, Inclusion, Demographics, Fiscal Policy, and Banking.
- Environmental Ecology, Biodiversity & Climate Change: Protected areas, IUCN species, Ramsar wetlands, UNFCCC conventions, and pollution.
- General Science: Space tech, Defense systems, Biotechnology, AI, Nanotechnology, and Everyday physics/chemistry.
CSAT (Aptitude Test)
Core Syllabus Units:
- Reading Comprehension: Passages on environment, philosophy, technology, and economy with critical inference & assumption questions.
- Interpersonal Skills: Communication and contextual logical understanding.
- Logical Reasoning & Analytical Ability: Syllogisms, blood relations, seating arrangements, directions, and critical puzzles.
- Decision Making & Problem Solving: Situational administrative choices (no negative marks applied).
- General Mental Ability: Coding-decoding, series, analogies, and visual pattern reasoning.
- Basic Numeracy (Class X Level): Number systems, percentages, ratios, averages, time-speed-distance, permutations, and probability.
- Data Interpretation (Class X Level): Charts, tables, graphs, pie-diagrams, and data sufficiency.
UPSC Mains Scheme 2027 (Written Descriptive • 9 Papers)
Paper A: Compulsory Indian Languages (22 Scheduled Languages • 300 Marks)
Candidates choose any 1 language from the 8th Schedule of the Constitution (25% qualifying = 75 marks):
General Studies I: Heritage, History, Society & Geography
- Art & Culture: Classical dance forms, temple architecture (Nagara/Dravida/Vesara), Mauryan/Gupta rock-cut art, Bhakti/Sufi movements.
- Modern Indian History: Middle of 18th century to 1947, 1857 mass revolt, socio-religious reforms, freedom struggle phases.
- Post-Independence & World History: Princely state integration, tribal consolidation, Industrial Revolution, World Wars, decolonization, Cold War.
- Indian Society: Women's organizations, population issues, poverty, urbanization, effects of globalization, communalism, secularism.
- Physical & Human Geography: Geomorphology, Climatology (monsoon mechanisms, cyclones), Oceanography, natural resources, industrial locations.
General Studies II: Governance, Constitution, Polity, Social Justice & IR
- Indian Constitution: Historical underpinnings, evolution, features, amendments, Basic Structure doctrine, comparative constitutions.
- Federalism & Legislature: Devolution of powers, 73rd/74th amendments, Parliament/State legislatures functioning, parliamentary privileges, RPA Act.
- Statutory Bodies: Election Commission, CAG, UPSC, Finance Commission, NITI Aayog, NHRC, tribunals.
- Governance & Social Justice: Welfare schemes for vulnerable sections, Health, Education, Poverty/Hunger, e-governance, Citizen's Charters.
- International Relations: Neighborhood relations, bilateral groupings (Quad, BRICS, G20, SCO), diaspora, effect of global politics on India.
General Studies III: Technology, Economy, Environment, Security & Disaster Management
- Indian Economy: Mobilization of resources, inclusive growth, Government budgeting, GST trends, capital formation.
- Agriculture & Food Security: Cropping patterns, irrigation, farm subsidies, MSP, PDS revamping, buffer stocks, food processing.
- Infrastructure & Science: Renewable energy, Green Hydrogen, PPP models, Space tech (Gaganyaan), AI, Biotechnology, IPR.
- Environment & Disaster Management: Biodiversity conservation, EIA, NDMA guidelines, CDRI, climate adaptation.
- Internal Security: Left-wing extremism (LWE), cyber security, money laundering, border security, CAPF mandates.
General Studies IV: Ethics, Integrity & Aptitude
- Ethics & Human Values: Essence, determinants and consequences of ethics, lessons from great leaders and administrators.
- Attitude & Civil Service Values: Integrity, impartiality, objectivity, empathy and compassion towards weaker sections.
- Emotional Intelligence & Thinkers: EI concepts in governance, Western and Indian moral philosophers.
- Probity in Governance: RTI, Codes of Ethics, Citizen's Charters, anti-corruption mechanisms.
- Section B Applied Case Studies (120–130 Marks): Real-world administrative dilemma resolution and constitutional morality.
List of UPSC Optional Subjects 2027 (Paper I & II)
Stage 3: Personality Test (Interview • 275 Marks)
The candidate is interviewed by a Board of observers who have before them a record of the candidate's career (Detailed Application Form - DAF). The objective of the interview is to assess the personal suitability of the candidate for a career in public administration.
1. Mental Caliber
Intellectual alertness, critical powers of assimilation, clear and logical exposition, and depth of interest.
2. Balance of Judgment
Balanced judgment on complex socio-economic issues, variety of interests, and constructive problem-solving stance.
3. Integrity & Leadership
Capacity for leadership, social cohesion, and intellectual and moral integrity under stress.
Standard Recommended Books for UPSC CSE 2027
| Paper / Subject | Standard Textbooks & Recommended Sources |
|---|---|
| GS 1 (History & Culture) | NCERT Class 11 An Introduction to Indian Art, Nitin Singhania, Spectrum Modern History by Rajiv Ahir, Bipin Chandra |
| GS 1 (Geography) | NCERT Class 11 Fundamentals of Physical Geography & India Physical Environment, GC Leong, Oxford Student Atlas |
| GS 1 (Society) | NCERT Class 12 Indian Society & Social Change and Development in India, Current Issues |
| GS 2 (Polity & Governance) | Indian Polity by M. Laxmikanth, Introduction to Constitution of India by DD Basu, 2nd ARC Reports (1st, 4th, 12th) |
| GS 2 (International Relations) | MEA Annual Reports, Ministry of External Affairs releases, ORF analyses, The Hindu editorials |
| GS 3 (Economy & Agriculture) | Indian Economy by Ramesh Singh or Nitin Singhania, Annual Economic Survey, Union Budget, NITI Aayog Strategy |
| GS 3 (Environment & S&T) | Shankar IAS Environment / PMF IAS, MoEFCC Annual Report, Science Reporter, ISRO/DRDO releases |
| GS 4 (Ethics, Integrity & Aptitude) | Lexicon for Ethics, Integrity & Aptitude, Ethics in Governance (2nd ARC 4th Report), Subba Rao & PN Roy Chowdhury |
UPSC CSE 2027 Curriculum Framework & Gazette Status Note
Aspirant Transparency, Structural Continuity & Synchronization Guarantee
1. Permanent Statutory Scheme
The 3-stage structure (Prelims 400M, Mains 1,750M, Interview 275M = 2,025M total) and micro-topic definitions represent the permanent examination scheme established by the Union Public Service Commission.
2. Annual Gazette Calendar
The formal Gazette notification, online application dates, and roll number portals for CSE 2027 will be issued by the Commission at upsc.gov.in. No core syllabus restructuring is anticipated.
3. 24-Hour Sync Guarantee
Upon release of the annual 2027 Gazette notification and examination calendar by the Commission, the UPSC AI research desk synchronizes all procedural and operational notices within 24 hours.
Public Commission Reference Portals
All syllabus breakdowns on this guide are synchronized with the published examination notifications of the Union Public Service Commission (UPSC). For official application forms, admit cards, and merit list roll numbers, refer to the portals below:
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UPSC Prelims Syllabus 2027 (Objective Stage • 400 Marks)
The Preliminary Examination serves as an elimination screening test. It consists of two compulsory multiple-choice objective papers conducted on a single day in two distinct shifts (Morning 9:30 AM – 11:30 AM and Afternoon 2:30 PM – 4:30 PM). Only candidates who secure at least 33% in CSAT (Paper II) and clear the category cut-off in GS Paper I are admitted to the Main Examination.
General Studies (GS 1)
Core Syllabus Units:
- Current Events of National & International Importance: Bilateral agreements, multilateral summits, major government schemes, geopolitical shifts, and technological breakthroughs.
- History of India & Indian National Movement: Ancient civilizations (Indus Valley, Vedic, Mauryan, Gupta), Medieval India (Delhi Sultanate, Mughals, Vijayanagara), and Modern Indian Freedom Struggle (1857 to 1947).
- Indian & World Geography: Physical, Social, and Economic Geography of India and the World, drainage systems, monsoon mechanisms, mineral resource distribution, and industrial locations.
- Indian Polity & Governance: Constitution, Political System, Panchayati Raj, Public Policy, Rights Issues, Fundamental Rights, Directive Principles, and Statutory Regulatory Bodies.
- Economic & Social Development: Sustainable Development, Poverty Alleviation, Inclusion, Demographics, Social Sector Initiatives, Fiscal & Monetary Policies, Inflation, and Banking.
- Environmental Ecology, Biodiversity & Climate Change: Protected area networks, IUCN Red List species, Ramsar wetlands, UNFCCC summits, carbon markets, and pollution mitigation.
- General Science: Space technology (ISRO missions), Defense indigenization, Biotechnology (CRISPR), Artificial Intelligence, Nanotechnology, and Everyday physics/chemistry.
CSAT (Aptitude Test)
Core Syllabus Units:
- Reading Comprehension: Complex analytical passages on environment, economics, philosophy, and technology with critical assumption and inference questions.
- Interpersonal Skills & Communication: Contextual interpretation and situational logical communication.
- Logical Reasoning & Analytical Ability: Syllogisms, blood relations, seating arrangements, directions, family trees, and critical logic puzzles.
- Decision Making & Problem Solving: Situational administrative choices (no negative marks applied on decision making questions).
- General Mental Ability: Coding-decoding, number series, analogies, pattern recognition, and spatial reasoning.
- Basic Numeracy (Class X Level): Number systems, percentages, ratios, averages, time-speed-distance, work-time, permutations-combinations, and probability.
- Data Interpretation (Class X Level): Tables, bar charts, line graphs, pie-diagrams, and data sufficiency questions.
UPSC Prelims Subject-Wise Marks Weightage Analysis
Historical analysis over the last 12 years confirms that **Environment, Polity, and Economy** consistently form the core backbone of Prelims, accounting for over 50% of the entire GS Paper 1 score. Strategic mastery over these high-yield domains guarantees clearing the cut-off.
| Subject Domain | Average Questions | Estimated Marks | Preparation Priority |
|---|---|---|---|
| Environment, Ecology, Biodiversity & Climate | 16 – 22 Questions | 32 – 44 Marks | Very High |
| Indian Polity, Constitution & Governance | 14 – 18 Questions | 28 – 36 Marks | High |
| Indian Economy & Social Development | 15 – 20 Questions | 30 – 40 Marks | High |
| History of India & Art/Culture | 13 – 16 Questions | 26 – 32 Marks | High |
| Science & Technology Indigenization | 10 – 14 Questions | 20 – 28 Marks | High |
| Current Affairs & International Summits | 12 – 16 Questions | 24 – 32 Marks | High |
| Geography (Physical, Indian & World) | 10 – 14 Questions | 20 – 28 Marks | Medium |
UPSC Mains Scheme 2027 (Written Descriptive • 9 Papers)
The Main Examination tests a candidate's intellectual depth, structural articulation, and analytical power through 9 descriptive papers written over 5 days.
| Paper Code | Subject / Nomenclature | Marks | Duration | Merit Status |
|---|---|---|---|---|
| Paper A | Compulsory Indian Language (8th Schedule) | 300 | 3 Hours | Qualifying (25% / 75 Marks) |
| Paper B | English Language (Comprehension & Précis) | 300 | 3 Hours | Qualifying (25% / 75 Marks) |
| Paper I | Essay (Section A + Section B) | 250 | 3 Hours | Counted for Merit |
| Paper II | General Studies I (Heritage, History, Society & Geography) | 250 | 3 Hours | Counted for Merit |
| Paper III | General Studies II (Governance, Constitution, Polity, Social Justice & IR) | 250 | 3 Hours | Counted for Merit |
| Paper IV | General Studies III (Technology, Economy, Environment, Security & DM) | 250 | 3 Hours | Counted for Merit |
| Paper V | General Studies IV (Ethics, Integrity, Aptitude & Case Studies) | 250 | 3 Hours | Counted for Merit |
| Paper VI | Optional Subject — Paper 1 | 250 | 3 Hours | Counted for Merit |
| Paper VII | Optional Subject — Paper 2 | 250 | 3 Hours | Counted for Merit |
| Total Written Mains Merit: | 1,750 Marks | Rank calculated out of 1,750 + 275 (Interview) | ||
General Studies I: Heritage, History, Society & Geography
1. Indian Heritage & Culture
Salient aspects of Art Forms, Literature and Architecture from ancient to modern times. Classical dances, folk theatre traditions, temple architecture (Nagara, Dravida, Vesara), Mauryan and Gupta rock-cut caves, Bhakti and Sufi movements, and Buddhist/Jain architecture.
2. Modern Indian History & Freedom Struggle
Significant events, personalities, and issues from the middle of the 18th century until independence. Stages of Freedom Struggle (1857 Revolt, Swadeshi, Non-Cooperation, Civil Disobedience, Quit India), socio-religious reforms (Raja Ram Mohan Roy, Jyotirao Phule), role of revolutionaries, Subhash Chandra Bose, INA, and regional contributors.
3. Post-Independence Consolidation & World History
Integration of Princely States (Sardar Patel), linguistic reorganization of states (Fazl Ali Commission), tribal consolidation, land reforms, Green Revolution, and foreign policy roots (NAM). World History: Industrial Revolution, World Wars, redrawal of national boundaries, colonization, decolonization, political philosophies (capitalism, socialism, communism).
4. Indian Society & Diversity
Salient features of Indian Society, Diversity of India. Role of women and women's organizations, population and associated issues, poverty, developmental issues, urbanization problems and remedies. Effects of globalization on Indian society, social empowerment, communalism, regionalism, and secularism.
5. Physical & Human Geography
Salient features of world's physical geography: Geomorphology (plate tectonics, earthquakes, volcanoes), Climatology (monsoon mechanisms, cyclones, El-Nino/La-Nina), Oceanography (currents, tides, resources). Distribution of key natural resources across the world including South Asia. Factors responsible for the location of primary, secondary, and tertiary sector industries.
General Studies II: Governance, Constitution, Polity, Social Justice & IR
1. Indian Constitution & Political System
Historical underpinnings, evolution, features, amendments, significant provisions, and Basic Structure doctrine. Comparison of the Indian constitutional scheme with other democratic nations (UK, USA, France, Germany).
2. Federalism & Separation of Powers
Functions and responsibilities of the Union and the States, federal challenges, devolution of powers and finances up to local levels (73rd & 74th Amendments). Separation of powers between organs, dispute redressal mechanisms and institutions.
3. Parliament, Legislatures & Executive
Structure, functioning, conduct of business, powers & privileges of Parliament and State Legislatures, anti-defection law (10th Schedule). Structure, organization and functioning of Ministries, Departments, Pressure groups, and formal/informal associations.
4. Statutory Bodies & Representation of People Act
Salient features of the Representation of People's Act (RPA). Appointment to various Constitutional posts, powers, functions and responsibilities of Constitutional, Statutory, Regulatory, and Quasi-judicial bodies (CAG, EC, UPSC, Finance Commission, NITI Aayog, NHRC, NGT).
5. Governance, Citizen Charters & Social Justice
Government policies and interventions for development in various sectors. Development processes: role of NGOs, SHGs, donors, and charities. Welfare schemes for vulnerable sections, mechanisms, laws, institutions. Issues relating to development and management of Health, Education, Human Resources, and Poverty/Hunger. Important aspects of governance, transparency, accountability, e-governance applications, and Citizen's Charters.
6. International Relations & Global Groupings
India and its neighborhood relations. Bilateral, regional and global groupings and agreements involving India and/or affecting India's interests (Quad, BRICS, SCO, G20). Effect of policies and politics of developed and developing countries on India's interests, Indian diaspora. Important International institutions: UN, WTO, IMF, World Bank.
General Studies III: Technology, Economy, Environment, Security & Disaster Management
1. Indian Economy & Planning
Indian Economy and issues relating to planning, mobilization of resources, growth, development and employment. Inclusive growth and issues arising from it. Government Budgeting and fiscal deficit management.
2. Agriculture & Food Security
Major crops and cropping patterns in various parts of the country, irrigation types, storage, transport and marketing of agricultural produce, e-technology in the aid of farmers. Farm subsidies, Minimum Support Prices (MSP); Public Distribution System (PDS) objectives, functioning, limitations, revamping; buffer stocks and food security; economics of animal-rearing. Food processing and related industries in India.
3. Infrastructure & Investment Models
Infrastructure: Energy (Renewable, Green Hydrogen), Ports, Roads, Airports, Railways. Public-Private Partnership (PPP) investment models (BOT, HAM, EPC).
4. Science & Technology
Science and Technology- developments and their applications in everyday life; achievements of Indians in science & technology; indigenization of technology. Awareness in IT, Space (Gaganyaan), Computers, Robotics, Nanotechnology, Biotechnology, and Intellectual Property Rights (IPR).
5. Environment, Biodiversity & Disaster Management
Conservation, environmental pollution and degradation, Environmental Impact Assessment (EIA). Disaster mitigation, NDMA guidelines, disaster resilient infrastructure (CDRI).
6. Internal Security & Cyber Threats
Linkages between development and spread of extremism (LWE). Role of external state and non-state actors in creating challenges to internal security. Cyber security, money-laundering and its prevention. Security challenges and their management in border areas; linkages of organized crime with terrorism. Mandates of various Security forces and agencies.
General Studies IV: Ethics, Integrity & Aptitude
1. Ethics & Human Interface
Essence, determinants and consequences of Ethics in human actions; dimensions of ethics; ethics in private and public relationships. Human Values: lessons from great leaders, reformers and administrators; role of family, society and educational institutions in inculcating values.
2. Attitude & Aptitude for Civil Services
Attitude: content, structure, function; its influence and relation with thought and behaviour; moral and political attitudes; social influence and persuasion. Foundational values for Civil Service: integrity, impartiality and non-partisanship, objectivity, dedication to public service, empathy, tolerance and compassion towards the weaker-sections.
3. Emotional Intelligence & Moral Thinkers
Emotional intelligence-concepts, and their utilities and application in administration and governance. Contributions of moral thinkers and philosophers from India and the world (Socrates, Plato, Aristotle, Kant, Mill, Gandhi, Kautilya).
4. Public Service Ethics & Probity in Governance
Public/Civil service values and Ethics in Public administration: status and problems; ethical concerns and dilemmas in government and private institutions; laws, rules, regulations and conscience as sources of ethical guidance; accountability and ethical governance; RTI, Codes of Ethics, Codes of Conduct, Citizen's Charters, Work culture, Quality of service delivery, Utilization of public funds, challenges of corruption.
5. Section B: Administrative Case Studies (120–130 Marks)
Detailed situational case studies evaluating real-world dilemma resolution, ethical framework application, and constitutional morality.
Standard Recommended Books for UPSC CSE 2027
Toppers universally recommend limiting references to one standard book per subject combined with multiple revisions and PYQ solving:
| Paper / Subject | Standard Textbooks & Recommended Sources |
|---|---|
| GS 1 (History & Culture) | NCERT Class 11 An Introduction to Indian Art, Nitin Singhania (Indian Art & Culture), Spectrum Modern India by Rajiv Ahir, Bipin Chandra (India's Struggle for Independence) |
| GS 1 (Geography) | NCERT Class 11 Fundamentals of Physical Geography & India Physical Environment, Certificate Physical & Human Geography by GC Leong, Orient BlackSwan / Oxford Student Atlas |
| GS 1 (Society) | NCERT Class 12 Indian Society & Social Change and Development in India, Ministry of Social Justice reports & Current Editorials |
| GS 2 (Polity & Governance) | Indian Polity by M. Laxmikanth, Introduction to Constitution of India by DD Basu, 2nd ARC Reports (1st, 4th, 12th Reports), PRS Legislative Research analyses |
| GS 2 (International Relations) | MEA Annual Reports, Ministry of External Affairs portal, Observer Research Foundation (ORF) briefs, The Hindu & Indian Express editorials |
| GS 3 (Economy & Agriculture) | Indian Economy by Nitin Singhania / Ramesh Singh, Annual Economic Survey (Ministry of Finance), Union Budget documents, NITI Aayog Strategy papers |
| GS 3 (Environment & S&T) | PMF IAS Environment / Shankar IAS, MoEFCC Annual Report, Down To Earth magazine, Science Reporter, ISRO and DRDO press releases |
| GS 4 (Ethics, Integrity & Aptitude) | Lexicon for Ethics, Integrity & Aptitude, 2nd ARC 4th Report (Ethics in Governance), Subba Rao & PN Roy Chowdhury, Harvard Justice course by Michael Sandel |
List of UPSC Optional Subjects 2027 (Paper I & II)
Candidates can select any one optional subject from the list below. The syllabus for optional subjects corresponds to an honors degree level (higher than bachelors, lower than masters).
Social Sciences & Humanities
Commerce & Management
Pure & Applied Sciences
Engineering Disciplines
Literature of Indian Languages (23 Languages)
Top rankers consistently score 285–310+ marks in their Optional papers. Check how Optional scores affect final service selection in our cut-off ledger.
Stage 3: Personality Test (Interview • 275 Marks)
The candidate is interviewed by a Board of observers who have before them a record of the candidate's career (Detailed Application Form - DAF submitted during the application cycle). The objective of the interview is to assess personal suitability for public service before determining the final recommended merit ranks. Candidate eligibility must satisfy all age and attempt criteria.
1. Mental Caliber
Intellectual alertness, critical powers of assimilation, clear and logical exposition, and depth of interest.
2. Balance of Judgment
Balanced judgment on complex socio-economic issues, variety of interests, and constructive problem-solving stance.
3. Integrity & Leadership
Capacity for leadership, social cohesion, and intellectual and moral integrity under stress.
Frequently Asked Questions on UPSC Syllabus 2027
Has the UPSC CSE syllabus changed for 2027?
No structural changes have been made to the core 3-stage examination scheme for 2027. The examination retains its structure: Preliminary Examination (GS 1 and CSAT), Main Examination (9 descriptive papers totaling 1,750 merit marks), and Personality Test (275 marks). However, the analytical depth in dynamic current affairs, technology indigenization, environment, and applied ethics case studies has significantly increased.
Are CSAT marks counted for the UPSC Prelims merit list?
No. General Studies Paper II (CSAT) is strictly qualifying in nature. Candidates must score a minimum of 33% (66 marks out of 200). Your Prelims rank and qualification for Mains depend solely on your net score in General Studies Paper I.
What is the total marks of the UPSC Civil Services Examination 2027?
The final merit list is calculated out of 2,025 marks. This comprises 1,750 marks from the 7 Main Examination merit papers (Essay, GS 1, GS 2, GS 3, GS 4, Optional Paper I & II) plus 275 marks from the Personality Test (Interview). The two qualifying language papers (300 marks each) and Prelims marks are not added to the final total.
How many optional subjects are there in UPSC Mains 2027?
Candidates must select one optional subject from the list of 26 core subjects (such as PSIR, Geography, Sociology, History, Anthropology, Public Administration) or from literature of 23 recognized languages. The selected optional has 2 papers of 250 marks each (Total: 500 marks).
Is there negative marking in UPSC Prelims and Mains?
In the Preliminary Examination, there is a penalty of 1/3rd of the marks assigned to that question for every incorrect answer (0.66 marks deducted in GS 1 and 0.83 marks in CSAT). In the Main Examination (descriptive papers), there is no objective negative marking, but penalties may be imposed by examiners for illegible handwriting, exceeding word limits, or violating question paper instructions.
Where can I download the UPSC Syllabus 2027 PDF guidebook?
You can download the comprehensive UPSC CSE Syllabus 2027 PDF guidebook directly from the download section on this page or view public examination notifications at upsc.gov.in.
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