UPSC CSE 2026 Syllabus – Prelims & Mains (Subject-Wise)

UPSC CSE 2026

Union Public Service CommissionGraduate hard

The UPSC CSE syllabus is one of the most expansive in Indian competitive examinations. It is divided into Prelims (screening) and Mains (merit). Understanding each paper's scope is essential for an efficient preparation strategy.

Prelims Syllabus

PaperKey Topics
GS Paper-I (200 marks)Current Events (National & International), History of India & Indian National Movement, Indian & World Geography (Physical, Social, Economic), Indian Polity & Governance (Constitution, Political System, Panchayati Raj), Economic & Social Development (Sustainable Development, Poverty, Demographics), Environment & Ecology, General Science
CSAT Paper-II (200 marks – Qualifying)Comprehension, Interpersonal Skills & Communication, Logical Reasoning & Analytical Ability, Decision Making & Problem Solving, General Mental Ability, Basic Numeracy (Class X level), Data Interpretation

Mains Syllabus – All 9 Papers

PaperSubjectMarksNature
Paper AIndian Language (One from 8th Schedule)300Qualifying
Paper BEnglish300Qualifying
Paper IEssay (2 essays)250Merit
Paper IIGS-I: Indian Heritage & Culture, History, Geography250Merit
Paper IIIGS-II: Governance, Polity, Constitution, Social Justice, IR250Merit
Paper IVGS-III: Technology, Economy, Environment, Security, Disaster Management250Merit
Paper VGS-IV: Ethics, Integrity & Aptitude250Merit
Paper VIOptional Subject – Paper 1250Merit
Paper VIIOptional Subject – Paper 2250Merit

Optional Subjects Available (48 options)

Candidates choose one optional subject from 48 options including Agriculture, Anthropology, Botany, Chemistry, Civil Engineering, Commerce & Accountancy, Economics, Electrical Engineering, Geography, Geology, History, Law, Management, Mathematics, Mechanical Engineering, Medical Science, Philosophy, Physics, Political Science & IR, Psychology, Public Administration, Sociology, Statistics, Zoology, and all major Indian Languages as literature.

Personality Test (Interview)

  • Conducted by a UPSC Board at UPSC Bhavan, New Delhi
  • Total marks: 275
  • Tests: Intellectual curiosity, leadership, balanced judgment, awareness of social issues, communication
  • No fixed syllabus – based on DAF (Detailed Application Form) entries

Frequently Asked Questions

Q.Which optional subject is most scoring in UPSC CSE Mains?

Subjects like Geography, Public Administration, Sociology, Anthropology, and Political Science are historically popular due to overlap with GS papers and consistent scoring. However, the best optional is the one you know deepest.

Q.Is the Prelims syllabus different from Mains GS?

There is significant overlap, but Mains GS is far more analytical and answer-writing focused. Prelims tests factual recall; Mains tests your ability to synthesize, critique, and present multi-dimensional answers.

Q.Has the UPSC CSE syllabus changed recently?

No major structural change since the 2013 reform. However, UPSC regularly shifts question emphasis toward current affairs, governance issues, and interdisciplinary topics. Always refer to the official notification PDF.

Q.Are Paper A and Paper B (language papers) counted in merit?

No. These are qualifying papers only. Candidates must score 25% (75/300) in each to be eligible for merit consideration.

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