The UPSC Civil Services Examination (CSE) syllabus is published in Appendix I of the annual notification on upsc.gov.in. For the 2027 cycle (Prelims on 23 May 2027), the syllabus is expected to remain the same as the 2026 notification — only examination dates change. Every paper — from Prelims General Studies to Mains optional subjects — draws its topic list from this document. Treating the syllabus as a coverage map, not a reading list, helps you plan months of study without missing high-weight areas or duplicating effort across stages.
Key highlights
- Prelims GS (Paper I) spans seven broad heads: current affairs, history, geography, polity, economy, environment, and general science.
- CSAT (Paper II) is qualifying at 33% — marks do not count toward Prelims merit.
- Mains merit rests on 7 papers totalling 1,750 marks: Essay, GS I–IV, and two optional papers.
- Two language papers (Indian language + English) are qualifying — failure disqualifies you from merit ranking.
- The official syllabus PDF in each year's notification is the only authoritative source.
Prelims General Studies (Paper I)
The Preliminary Examination's General Studies Paper I carries 200 marks across 100 multiple-choice questions. UPSC groups the syllabus into the following major heads:
| Section | Topics covered |
|---|---|
| Current events | National and international importance |
| History | Ancient, medieval, and modern India; Indian National Movement |
| Geography | Physical, social, and economic geography of India and the world |
| Polity & governance | Constitution, political system, Panchayati Raj, public policy, rights issues |
| Economy | Economic and social development, poverty, inclusion, demographics, social-sector initiatives |
| Environment | Ecology, biodiversity, climate change — general issues not requiring subject specialisation |
| General science | Developments in science and technology of everyday observation |
Prelims GS is wide but shallow relative to Mains. Questions test conceptual clarity and factual recall across the entire breadth, often linking static topics with current affairs.
CSAT (Paper II)
Civil Services Aptitude Test is a separate qualifying paper held the same afternoon as GS Paper I. It covers comprehension, interpersonal skills, logical reasoning, analytical ability, decision making, basic numeracy, and data interpretation — all at roughly Class X level. See the dedicated CSAT syllabus guide for section-wise breakdown and preparation tips.
Mains General Studies (Papers I–IV)
The Main Examination tests depth through descriptive answers over four General Studies papers, each worth 250 marks:
| Paper | Syllabus focus |
|---|---|
| GS I | Indian heritage and culture; history of India and the world; geography of India and the world; society |
| GS II | Governance, Constitution, polity, social justice, international relations |
| GS III | Technology, economic development, biodiversity, security, disaster management |
| GS IV | Ethics, integrity, and aptitude — see the Ethics syllabus guide |
Each GS paper lists specific sub-topics in the notification. Mains answers require structured writing, diagrams where relevant, and multi-dimensional analysis — not bullet-point dumps.
Essay Paper
The Essay paper (250 marks) has no micro-syllabus. Candidates choose and write two essays from a set of topics spanning philosophy, society, governance, and contemporary issues. The Essay syllabus guide covers evaluation criteria and preparation strategy.
Optional Subject Papers
Candidates select one optional subject from a list of 48 subjects notified each year. Two papers — Optional I and Optional II — carry 250 marks each and together account for 500 of 1,750 Mains merit marks. Syllabus PDFs for each optional are published separately by UPSC. Read the optional subject syllabus guide for selection criteria and reading strategy.
Qualifying Language Papers
| Paper | Requirement |
|---|---|
| Paper A — Indian Language | One of the languages listed in the Eighth Schedule; 300 marks |
| Paper B — English | 300 marks; tests comprehension and précis writing |
Minimum qualifying marks are notified each year. These papers do not count toward the final rank but must be cleared to remain in the race.
How to use the syllabus in your study plan
A practical three-phase approach:
- Months 1–6: Cover Prelims-wide GS once — history, polity, geography, economy, environment, science, and daily current affairs.
- Months 4–8: Deepen Mains themes in parallel — start answer writing for GS papers while Prelims revision continues.
- Months 6 onward: Dedicate focused blocks to optional subject, Essay, and Ethics (GS IV) with timed writing practice.
Print the notification syllabus, highlight completed topics, and revisit gaps after each mock test cycle.
UPSC Relevance
The syllabus is the contract between UPSC and the candidate. Examiners frame questions strictly within notified topics, though the angle may be contemporary. Aspirants who map every mock-test mistake back to a syllabus bullet build coverage systematically rather than chasing random current-affairs threads. For service allocation, only Mains (1,750) + Interview (275) marks count — but you cannot reach Mains without clearing the Prelims syllabus breadth first.
Previous Year Questions
Syllabus-aligned PYQ analysis reveals recurring patterns:
- Prelims GS: Polity (Constitutional articles, schemes), environment (conventions, species), and economy (reports, indices) appear almost every year. History often links freedom-movement leaders with contemporary policy.
- Mains GS I: Art and culture, post-independence history, and geography-based disaster questions are staples.
- Mains GS II: Governance schemes, IR bilateral relations, and social-justice legislation dominate.
- Mains GS III: Agriculture, internal security, S&T applications, and economic survey themes recur.
Tag at least the last 10 years of questions to syllabus headings — gaps become visible quickly.
Prelims Focus
For Prelims, prioritise breadth over depth. Current affairs from the last 12–18 months should overlay every static section. CSAT needs a minimum 33% score — do not neglect it even if your GS preparation feels strong. Negative marking (−⅓ per wrong answer) means accuracy matters more than attempting every question. Read the Prelims exam pattern for paper structure and marking rules.
Mains Focus
Mains demands answer-writing discipline from day one of preparation — not just after Prelims results. Each GS paper expects introductions, body paragraphs with sub-headings, and balanced conclusions. Optional papers often decide rank margins because 500 marks sit outside GS. Essay and Ethics reward clarity and structure over ornamental language. See the Mains exam pattern for the nine-paper schedule.
Frequently asked questions
Where can I download the official UPSC syllabus?
The syllabus is attached as Appendix I in the annual CSE notification PDF, available at upsc.gov.in. Optional subject syllabi are published as separate PDFs in the "Examination" section.
Does the Prelims syllabus differ from Mains?
Yes. Prelims GS is broader and shallower — seven major heads without sub-topic detail. Mains GS papers list granular sub-topics requiring descriptive depth. Topics overlap (e.g., polity, history) but the format and depth differ sharply.
Is CSAT part of the Prelims syllabus?
CSAT is Paper II of the Preliminary Examination with its own syllabus (comprehension, reasoning, numeracy). It is qualifying only — your Prelims rank depends on GS Paper I marks alone.
How many optional subjects can I choose?
You select one optional subject for Mains. It appears as two papers (Paper VI and Paper VII), each worth 250 marks.
Do language paper marks affect my rank?
No. Papers A and B are qualifying. However, failing either paper disqualifies you from merit ranking regardless of GS and optional scores.
Key Takeaways
- The official notification syllabus on upsc.gov.in is your single source of truth — not coaching notes or third-party compilations.
- Prelims tests breadth across seven GS heads; Mains tests depth across nine papers including Essay, four GS papers, and two optional papers.
- CSAT is qualifying at 33% — strong GS alone cannot carry you through Prelims.
- Optional subject preparation should begin by month six at the latest, given its 500-mark weight in Mains merit.
- Map PYQs to syllabus bullets to find coverage gaps systematically.