Here is the list of subjects for IAS/UPSC exams as per the UPSC Syllabus.

IAS Prelims Syllabus for UPSC Civil Services Exam
General Studies Paper I
Maximum marks : 200
Number of Questions : 100
Total Time : 120 minutes (02 hours)

Syllabus
1. Current events of national and international importance
2. History of India and Indian national movement
3. Indian and World Geography
4. Indian Polity and governance
5. Economic and social development
6. General issues on environmental ecology, bio-diversity and climate change
7. General Science

General Studies Paper II
Maximum marks : 200
Number of Questions : 80
Total Time : 120 minutes (02 hours)

Syllabus
1. Comprehension
2. Interpersonal skills which include communication skills
3. Logical reasoning & analytical ability
4. Decision making & problem solving
5. General mental ability
6. Basic numeracy
7. English language comprehension skills (Class X level)

IAS Mains Syllabus for UPSC Civil Services Exam
Paper I (One of the Indian Languages to be selected by the candidate)
Maximum marks : 200

Paper II (English)
Maximum marks : 300

Paper III (Essay)
Maximum marks : 200

Paper IV & V (General Studies)
Maximum marks : 600

Paper VI, VII, VIII, IX (Any two subjects (each having 2 papers) to be selected from the prescribed optional subjects)
Maximum marks : 1200

Optional Subjects
Agriculture
Animal Husbandry and Veterinary Science
Botany
Chemistry
Civil Engineering
Commerce
Economics
Electrical Engineering
Geography
Geology
Indian History
Law
Management
Mathematics
Mechanical Engineering
Medical Science
Philosophy
Physics
Political Science
Psychology
Public Administration
Sociology
Statistics
Zoology
Anthropology
Arabic
Assamese
Bengali
Bodo
Chinese
Dogri
English
French
German
Gujarati
Hindi
Kannada
Kashmiri
Konkani
Maithili
Malayalam
Manipuri
Marathi
Nepali
Oriya
Pali
Persian
Punjabi
Russian
Sanskrit
Santali
Sindhi
Tamil
Telugu
Urdu