UPSC Mains Subjects List, Compulsory Subjects and Optional Subjects 2025

Check the UPSC Mains Subjects List 2025, including compulsory and optional subjects. Get details on GS papers, essay, and language papers for effective preparation.

UPSC Mains subjects
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The UPSC Mains Subjects demand comprehensive preparation and a deep understanding of various topics. Each paper holds unique importance and requires tailored strategies for success. The Mains examination, the second stage of the selection process, evaluates candidates on their academic knowledge, analytical skills, and writing ability. This article provides an in-depth overview of UPSC Mains Subjects and their importance for aspirants.

Overview of UPSC Mains Subjects

The UPSC Mains Subjects are designed to assess candidates’ intellectual depth and understanding of diverse fields. This stage consists of nine papers, categorized into compulsory and optional subjects. While some papers test general aptitude and language proficiency, others evaluate the aspirant’s knowledge in specific areas.

The structure of the Mains subjects ensures a balanced evaluation, requiring candidates to excel in both their chosen optional subjects and the General Studies papers. A clear understanding of the UPSC Mains Subjects is vital for effective preparation and success in this competitive examination.

Overview of the UPSC Mains Subjects List
Paper Type Marks
Paper A Indian Language 300
Paper B English 300
Paper I Essay 250
Paper II GS 1 250
Paper III GS 2 250
Paper IV GS 3 250
Paper V GS 4 250
Paper VI & VII Optional Subject 500
Total 1750

UPSC Mains Subjects List 2025

The UPSC Mains Examination consists of nine papers, including four General Studies (GS) papers, an essay paper, two optional papers, and two qualifying language papers. The compulsory subjects for the UPSC exam include GS papers and two language papers, designed to test candidates’ comprehensive knowledge and analytical skills. Marks from seven papers (excluding qualifying papers) determine the final rank and selection.

Paper Description
Essay Paper Candidates write two essays, one from each section, testing articulation, coherence, and structure.
GS Paper 1 Covers Indian Heritage and Culture, History, Geography, globalization, social empowerment, and more.
GS Paper 2 Focuses on Governance, Constitution, Polity, Social Justice, and International Relations.
GS Paper 3 Includes Technology, Economic Development, Biodiversity, Environment, Security, and Disaster Management.
GS Paper 4 (Ethics) Deals with Ethics, Integrity, and Aptitude; evaluates ethical and moral perspectives.
Indian Language Paper Tests proficiency in an Indian language chosen from the Eighth Schedule of the Constitution.
English Language Paper Assesses English language skills; marks are not included in the final ranking.
Optional Paper 1 Questions based on an optional subject chosen from UPSC’s list.
Optional Paper 2 The second paper of the chosen optional subject.

UPSC Optional Subjects List For Mains

The following is the list of optional subjects offered by UPSC for the Mains examination:

  • Agriculture
  • Animal Husbandry and Veterinary Science
  • Anthropology
  • Botany
  • Chemistry
  • Civil Engineering
  • Commerce and Accountancy
  • Economics
  • Electrical Engineering
  • Geography
  • Geology
  • History
  • Law
  • Management
  • Mathematics
  • Mechanical Engineering
  • Medical Science
  • Philosophy
  • Physics
  • Political Science and International Relations
  • Psychology
  • Public Administration
  • Sociology
  • Statistics
  • Zoology
  • Literature of any one of the following languages: Assamese, Bengali, Gujarati, Hindi, Kannada, Kashmiri, Konkani, Malayalam, Manipuri, Marathi, Nepali, Odia, Punjabi, Sanskrit, Sindhi, Tamil, Telugu, Urdu, and English.

UPSC Mains Subjects FAQs

UPSC offers a total of 25 optional subjects and 23 literature subjects for candidates to choose from. Each candidate must select one optional subject, which consists of two papers, contributing a total of 500 marks to the final score.

Yes, candidates can select any optional subject from the list provided by UPSC. However, it is advisable to choose a subject based on interest, background knowledge, and availability of study materials. Certain technical subjects may be more suitable for candidates with a specialized academic background.

The Indian language paper is compulsory for all candidates except those from Arunachal Pradesh, Manipur, Meghalaya, Mizoram, Nagaland, and Sikkim. These candidates are exempted from the Indian language paper as per UPSC guidelines.

The optional subject plays a crucial role in UPSC Mains as it carries 500 marks out of the total 1750. A strong performance in the optional subject can significantly impact a candidate’s final rank and chances of selection in the Civil Services Examination.


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Are you dreaming of becoming an IAS officer? Then, IAShub can be your best guide. It is one of the Best IAS Coaching in Delhi. Many students who want to clear the UPSC exam join IAShub for learning. The institute gives both online and offline classes. Their teachers are experienced and helpful. They easily explain every topic. Students also get notes, tests, and tips to do well in the exam.

UPSC Online Classes by IAShub

IAShub is in Delhi and is trusted by many UPSC students. It offers coaching for every part of the UPSC exam – Prelims, Mains, and Interview. The classes are simple and easy to understand. The teachers are experts and guide students in the right way. IAShub is also known for its helpful notes, test series, and answer-writing practice. IAShub is the best coaching in Delhi and also gives UPSC Online Classes. This helps students from any place in India to learn. The online classes are live and also recorded. So, students can watch them anytime. These classes cover the full UPSC syllabus.

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  • Live Classes: Students who live far can join live UPSC online classes. These classes are just like real classes.
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UPSC Exam Overview

The UPSC Civil Services Exam has three parts:

  • Prelims: It has two papers: General Studies and CSAT.
  • Mains: It has nine papers, including essays and optional subjects.
  • Interview: It tests the personality and confidence of the student.

This exam is tough, but with the right guidance, it becomes easy to manage. Students must study smart and stay regular.

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IAShub supports students from the beginning to the end. It gives the right books, tests, and notes. The classes are easy to follow, and the teachers are always ready to help. Students get personal doubt sessions too. The test series and answer checking help students learn where they need to do better. Also, free study materials save time and money.
IAShub also guides students during the final stage – the interview. Experts take mock interviews and give useful tips. This full support makes IAShub one of the best IAS coaching in Delhi.

Best IAS Coaching In Delhi FAQs

Yes, IAShub offers live and recorded online classes. Students can attend from any part of India.

Classes are available in both English and Hindi, so students can choose the language they are comfortable with.

The classroom centre is located in Delhi. Students can visit and join offline batches there.

IAShub gives interview guidance sessions to help students prepare for the final round of UPSC.
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