UPSC CSE Main Examination: Compulsory & Optional Subjects
The Union Public Service Commission (UPSC) Civil Services Examination (CSE) is conducted in three stages: Preliminary Examination, Main Examination, and Personality Test (Interview). Among these stages, the Main Examination (Mains) is considered the most important because its marks directly contribute to the final merit ranking of candidates.
The UPSC CSE Main Examination is designed to evaluate a candidate's intellectual depth, analytical ability, critical thinking, writing skills, and overall suitability for a career in public administration. Unlike the Preliminary Examination, which consists of objective-type questions, the Main Examination is entirely descriptive in nature and requires candidates to write detailed answers within a limited time.
■ Structure of UPSC CSE Main Examination
The UPSC Civil Services Main Examination consists of nine papers (7 compulsory + 2 optional papers).
| Paper | Subject | Marks |
|---|---|---|
| Paper A | Indian Language (Qualifying) | 300 |
| Paper B | English (Qualifying) | 300 |
| Paper I | Essay | 250 |
| Paper II | General Studies I | 250 |
| Paper III | General Studies II | 250 |
| Paper IV | General Studies III | 250 |
| Paper V | General Studies IV (Ethics) | 250 |
| Paper VI | Optional Subject Paper I | 250 |
| Paper VII | Optional Subject Paper II | 250 |
- Total Papers: 09
- Total Marks for Merit = 1750
- The first two language papers (Paper A & B) are qualifying in nature, while the remaining seven papers are counted for merit.
- Candidates must choose one optional subject from the given list, and UPSC conducts two papers (each of 250 marks) for that subject:
- The applicant qualifying the main exam are shortlisted for the next stage: interview. The final merit is made based on 2025 Marks (1750 marks of main exam + 275 marks of interview)
■ Complete List of UPSC CSE Main Examination Papers
1. Paper A: Indian Language (Qualifying)
Marks: 300
Duration: 3 Hours
Candidates must choose one language from the Eighth Schedule of the Constitution of India.
This paper evaluates:
- Reading comprehension
- Precis writing
- Translation skills
- Grammar and vocabulary
- Essay writing
- Expression and communication ability
Languages Available:
- Assamese
- Bengali
- Bodo
- Dogri
- Gujarati
- Hindi
- Kannada
- Kashmiri
- Konkani
- Maithili
- Malayalam
- Manipuri
- Marathi
- Nepali
- Odia
- Punjabi
- Sanskrit
- Sindhi
- Tamil
- Telugu
- Urdu
- Santali and other approved languages.
2. Paper B: English Language (Qualifying)
Marks: 300
Duration: 3 Hours
This paper assesses a candidate's basic proficiency in English.
Topics Covered:
- Reading comprehension
- Precis writing
- Grammar
- Vocabulary
- Short essays
- Language usage
Although qualifying in nature, candidates must secure the minimum prescribed marks to have their merit papers evaluated.
■ Merit-Based Papers
The following seven papers are counted in the final ranking.
Paper I: Essay
Marks: 250
Duration: 3 Hours
Candidates are required to write essays on topics related to:
- Social issues
- Political developments
- Governance
- Economy
- Philosophy
- Ethics
- International affairs
- Science and technology
This paper evaluates:
- Clarity of thought
- Structure and presentation
- Logical reasoning
- Depth of understanding
- Writing skills
3. Paper II: General Studies I (GS-I)
Marks: 250
Duration: 3 Hours
Subjects Covered
A. Indian Heritage and Culture
- Art and culture
- Architecture
- Literature
B. Indian History
- Ancient India
- Medieval India
- Modern India
- Freedom struggle
C. World History
- Industrial Revolution
- World Wars
- Colonization
- Political ideologies
D. Indian Society
- Diversity
- Social empowerment
- Women-related issues
- Globalization
E. Geography
- Physical Geography
- Indian Geography
- World Geography
- Natural resources
4. Paper III: General Studies II (GS-II)
Marks: 250
Duration: 3 Hours
Subjects Covered:
A. Governance
- Government policies
- Public administration
- E-governance
B. Indian Constitution
- Constitutional provisions
- Amendments
- Federal structure
C. Polity
- Parliament
- Judiciary
- Executive
- Constitutional bodies
D. Social Justice
- Welfare schemes
- Health
- Education
- Vulnerable sections
E. International Relations
- India's foreign policy
- Bilateral relations
- International organizations
5. Paper IV: General Studies III (GS-III)
Marks: 250
Duration: 3 Hours
Subjects Covered:
A. Indian Economy
- Economic development
- Budgeting
- Inclusive growth
B. Agriculture
- Cropping systems
- Food security
- Agricultural reforms
C. Science and Technology
- Innovation
- Space technology
- Biotechnology
D. Environment
- Biodiversity
- Conservation
- Climate change
E. Disaster Management
F. Internal Security
- Cyber security
- Terrorism
- Border management
6. Paper V: General Studies IV (GS-IV)
Marks: 250
Duration: 3 Hours
Subjects Covered:
- Ethics
- Integrity
- Aptitude
- Emotional Intelligence
- Public Service Values
- Case Studies
This paper focuses on ethical decision-making and moral reasoning required in public administration.
■ Optional Subject Papers
Candidates must choose one optional subject from the list prescribed by UPSC. The selected subject is examined through two papers.
7. Paper VI: Optional Subject – Paper I
Marks: 250
Duration: 3 Hours
8. Paper VII: Optional Subject – Paper II
Marks: 250
Duration: 3 Hours
■ Complete List of UPSC Optional Subjects
UPSC currently offers 48 optional subjects, including literature and non-literature subjects.
A. Non-Literature Optional Subjects
- Political Science and International Relations
- Agriculture
- Psychology
- Mechanical Engineering
- Economics
- Anthropology
- Chemistry
- Public Administration
- Medical Science
- Geography
- Commerce and Accountancy
- Zoology
- Law
- Physics
- Sociology
- Civil Engineering
- Philosophy
- Animal Husbandry and Veterinary Science
- Statistics
- Management
- History
- Electrical Engineering
- Botany
- Mathematics
- Geology
B. Literature Optional Subjects
- English Literature
- Telugu Literature
- Punjabi Literature
- Assamese Literature
- Sanskrit Literature
- Marathi Literature
- Maithili Literature
- Tamil Literature
- Bengali Literature
- Kashmiri Literature
- Hindi Literature
- Konkani Literature
- Malayalam Literature
- Sindhi Literature
- Gujarati Literature
- Dogri Literature
- Urdu Literature
- Odia Literature
- Kannada Literature
- Bodo Literature
- Nepali Literature
- Santali Literature
- Manipuri Literature
■ Conclusion
The UPSC Civil Services Main Examination is a comprehensive assessment designed to evaluate a candidate's academic knowledge, analytical thinking, writing ability, ethical judgment, and administrative aptitude. The examination consists of nine papers, including language papers, an Essay paper, four General Studies papers, and two Optional Subject papers. Since the marks obtained in the Mains examination play a decisive role in the final selection, a thorough understanding of the exam structure and subject-wise syllabus is essential for every serious UPSC aspirant.