UPSC CSE Syllabus & Exam Pattern
Complete three-stage structure of UPSC CSE — Prelims, Mains and Interview — with paper-wise syllabus and marks breakdown.
Last reviewed: August 2026
The Three-Stage Structure
UPSC CSE is conducted in 3 stages: Prelims (objective screening), Mains (written), and the Personality Test (Interview).
- Stage 1 — Prelims
- Objective/MCQ, 2 papers, 400 marks total. Only GS Paper-I counts for the cutoff; CSAT is qualifying. Prelims marks do not count toward final ranking.
- Stage 2 — Mains
- 9 written papers, of which 7 count toward merit. Written merit = 1750 marks.
- Stage 3 — Interview
- Personality Test worth 275 marks. Final merit = 1750 + 275 = 2025 marks.
Prelims is only the gateway
Final rank is decided by Mains (1750) + Interview (275) = 2025 marks. Prelims marks are used only for screening into Mains.
Prelims — Exam Pattern
Prelims is a one-day screening examination with two papers.
| Paper | Subject | Questions | Marks | Time | Nature |
|---|---|---|---|---|---|
| Paper I | General Studies | 100 | 200 | 2 hours | Merit for cutoff |
| Paper II | CSAT | 80 | 200 | 2 hours | Qualifying |
| Total | 180 | 400 | 4 hours |
CSAT needs 33% minimum
200 x 33% = 66 marks — you must score at least 66/200 in CSAT. Do not assume 'qualifying' means you can skip preparing it; you need enough practice to safely cross 66.
Prelims GS Paper-I — Syllabus Areas
GS Paper-I is the most important Prelims paper. Its official syllabus spans current events, history, geography, polity, economy, environment and science & technology.
- Current Events
- National and international importance: government schemes, legislation, Supreme Court judgments, international organizations and relations, reports and indices, environment, S&T, economy, personalities, awards, places in news, defence.
- History of India
- Ancient (Indus Valley, Vedic period, Buddhism, Jainism, Mauryan, Gupta, Sangam age, art and culture), Medieval (Delhi Sultanate, Mughals, Vijayanagara, Bhakti and Sufi movements, Marathas, architecture, administration) and Modern India.
- Indian National Movement
- Formation of INC, Moderates vs Extremists, Partition of Bengal, Swadeshi, Home Rule, Gandhian movements (Champaran, Kheda, Non-Cooperation, Civil Disobedience, Dandi March, Quit India), Round Table Conferences, Government of India Acts, INA, Cabinet Mission, Independence and Partition. UPSC asks conceptual, analytical questions — not merely dates.
- Indian & World Geography
- Physical geography (earth's interior, plate tectonics, earthquakes, volcanoes, climate, monsoon, cyclones, ocean currents, soils), Indian geography (Himalayas, plains, plateau, rivers, agriculture, minerals, industries, population) and world geography (continents, mountains, rivers, deserts, climate regions).
- Polity & Governance
- One of the highest-value areas: Constitution (Preamble, FRs, DPSP, amendments, Basic Structure), Union Government, Parliament, Judiciary, federalism, constitutional bodies (EC, UPSC, CAG, Finance Commission), statutory bodies (NHRC, CIC, CVC, Lokpal, NGT) and local government (73rd/74th Amendments).
- Economy
- Understand how the Indian economy works: GDP/GNP/NNP, inflation, deficits, BoP; banking (RBI, repo, CRR, SLR, NPAs); government finances (budget, taxation, fiscal policy, public debt); external sector (trade, forex, FDI/FPI, WTO); development (poverty, inclusive growth, financial inclusion, infrastructure).
- Environment & Ecology
- Ecology basics (ecosystem, food chains, pyramids, succession), biodiversity (endemic, keystone, invasive, threatened species), conservation (National Parks, Sanctuaries, Biosphere Reserves, Tiger Reserves, Ramsar Sites), issues (climate change, pollution, desertification) and conventions (UNFCCC, Paris Agreement, CBD, Ramsar, CITES, Montreal Protocol).
- Science & Technology
- Application-oriented: biology (diseases, vaccines, genetics), biotechnology (CRISPR, gene therapy, stem cells, mRNA), space (ISRO, satellites, launch vehicles, missions), physics (nuclear, semiconductors) and emerging tech (AI, ML, quantum computing, blockchain, nanotech, robotics, 5G/6G, cybersecurity).
CSAT — Prelims Paper II
CSAT is qualifying, but the syllabus is still substantial.
- Comprehension — reading passages, understanding arguments, inference, conclusions.
- Communication and interpersonal skills — basic communication-related questions.
- Logical reasoning — statements, arguments, conclusions, assumptions, logical relationships.
- Analytical ability — arrangements, puzzles, data-based reasoning.
- Decision making.
- Basic numeracy (Class X level) — number system, percentage, ratio and proportion, average, profit & loss, time & work, time & distance, simple/compound interest, basic algebra.
- Data interpretation — tables, graphs, charts, data comparison.
Mains — The Real UPSC Examination
Mains is where the competition becomes much more serious. It consists of 9 papers, of which 7 count for merit.
| Paper | Subject | Marks | Counted for Merit? |
|---|---|---|---|
| Paper A | Indian Language | 300 | No (qualifying) |
| Paper B | English | 300 | No (qualifying) |
| Paper I | Essay | 250 | Yes |
| Paper II | GS-I | 250 | Yes |
| Paper III | GS-II | 250 | Yes |
| Paper IV | GS-III | 250 | Yes |
| Paper V | GS-IV | 250 | Yes |
| Paper VI | Optional-I | 250 | Yes |
| Paper VII | Optional-II | 250 | Yes |
| Total Merit | 1750 |
Personality Test adds 275 marks, so the final merit total is 1750 + 275 = 2025 marks. Paper A is one Indian language chosen from those specified by UPSC (e.g. Marathi, Hindi, Bengali, Gujarati, Kannada, Malayalam, Tamil, Telugu, Urdu, Sanskrit) and requires only the prescribed minimum. Paper B (English) tests comprehension, precis writing, usage, vocabulary, short essays and basic language skills — its marks are not added to final merit.
Essay Paper (250 marks)
Topics can involve philosophy, society, politics, economy, technology, environment, education, women, democracy, ethics and development. UPSC expects: Introduction, Arguments, Examples, Counter-view, Analysis, Way forward, Conclusion. An essay is NOT a GS answer stretched to several pages.
The Four GS Papers of Mains
- GS-I — Heritage, History, Geography, Society (250)
- Indian culture (art, architecture, literature, music, dance, paintings), modern history from the 18th century and the freedom struggle, world history (Industrial Revolution, World Wars, American/French/Russian Revolutions, colonialism, decolonization), Indian society (diversity, women, population, urbanization, globalization, communalism, regionalism, secularism) and geography (physical geography, resources, industries, geographical phenomena).
- GS-II — Polity, Governance, Social Justice, IR (250)
- Heavily focused on Constitution + governance + current affairs: polity (Parliament, Executive, Judiciary, federalism, constitutional bodies), governance (transparency, accountability, e-governance, citizen charters, NGOs, SHGs, civil society), social justice (health, education, poverty, vulnerable sections, welfare schemes) and IR (India-USA/Russia/China/EU/Japan/Africa, neighbourhood, UN, WTO, IMF, World Bank, regional organizations).
- GS-III — Economy, S&T, Environment, Security (250)
- A very broad paper: economy (growth, employment, inclusive growth, budget, infrastructure, investment), agriculture (cropping patterns, irrigation, MSP, subsidies, food processing, PDS), science & technology (emerging tech, space, biotech, AI, robotics, IT), environment (conservation, climate change, pollution, EIA) and internal security (terrorism, cybersecurity, money laundering, organized crime, border security, insurgency, extremism).
- GS-IV — Ethics, Integrity & Aptitude (250)
- Different from other GS papers: ethics and human interface, human values, attitude, emotional intelligence, moral thinkers, ethics in public administration; integrity, probity, transparency, accountability, public service values; aptitude (objectivity, impartiality, non-partisanship, dedication, empathy, compassion) — plus case studies.
GS-IV case studies are extremely important
You are given practical administrative situations (e.g. as District Collector, a scheme bridge has serious defects and the contractor is politically influential). You must identify stakeholders, ethical issues, options, pros/cons, the best course of action and its justification.
Optional Subject & Personality Test
You choose ONE optional subject with two papers of 250 marks each — 500 marks in total, a huge component of your final ranking. UPSC lists optionals including Agriculture, Anthropology, Geography, History, Law, Mathematics, Political Science & International Relations, Public Administration, Sociology and literature subjects. Popular choices include Geography, History, Sociology, Anthropology, PSIR, Public Administration, Philosophy, Economics, Mathematics and literature subjects.
- The Interview (275 marks) is not a normal job interview — it assesses personality and suitability for civil services rather than factual knowledge.
- Qualities evaluated: mental alertness, critical thinking, logical reasoning, balance of judgement, leadership, social awareness, integrity, intellectual curiosity, interest in current affairs, communication ability, suitability for public service.
How final rank is decided
Candidate A with Mains 950/1750 + Interview 180/275 = 1130/2025 ranks higher than Candidate B with Mains 900 + Interview 220 = 1120. Mains + Interview alone determine the final ranking.
Prelims vs Mains — The Biggest Differences
| Feature | Prelims | Mains |
|---|---|---|
| Type | Objective | Descriptive |
| Main purpose | Screening | Ranking |
| Questions | MCQ | Written answers |
| Negative marking | Yes | No |
| Current affairs | Important | Very important |
| Static syllabus | Important | Very important |
| Answer writing | No | Yes |
| Optional | No | Yes |
| Total merit marks | 0 | 1750 |
| Interview | No | After qualification |
- Prelims game
- Knowledge + elimination + accuracy + revision + test practice.
- Mains game
- Knowledge + understanding + analysis + answer writing + examples.
- Interview game
- Personality + awareness + balanced thinking + communication.
The Whole Syllabus in One Page
- Prelims GS-I: Current Affairs, History, Art & Culture, Geography, Polity, Economy, Environment, Science & Technology.
- Prelims GS-II (CSAT): Comprehension, Reasoning, Analytical ability, Decision making, Basic mathematics, Data interpretation.
- Mains: Essay; GS-I (Culture + History + Society + Geography); GS-II (Polity + Governance + Social Justice + IR); GS-III (Economy + Agriculture + S&T + Environment + Security); GS-IV (Ethics + Integrity + Aptitude + Case Studies); Optional (one subject x 2 papers); then Interview.
The syllabus is your master document
Don't prepare randomly from YouTube, Telegram, newspapers and books. Always follow: Syllabus > Previous Year Questions > Sources > Notes > Revision > Tests. UPSC's own previous-year papers show the actual level and style of questions.
More UPSC CSE Guides
- Mains Answer Writing Strategy
- Books & Resource Recommendations
- Topic-wise Important Questions
- Marking System, Cut-offs & Attempts
- Subject-wise Preparation Strategy
UPSC Civil Services Examination (CSE) overview · All government exams · Study material