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There is compulsory rule of 2 optional subjects. There are 7 papers in total and then interview out of which Paper 6 & paper 7 are kept for optional subjects.

. There are 25 optional subjects in UPSC civil services exam OPTIONAL SUBJECTS IN UPSC

• Agriculture

• Animal Husbandry and Veterinary Science

• Anthropology

• Botany

• Chemistry

• Civil Engineering

• Commerce & Accountancy

• Economics

• Electrical Engineering

• Geography

• Geology

• History

• Law

• Management

• Mathematics

• Mechanical Engineering

• Medical Science

• Philosophy

• Physics

• Political Science & International Relations

• Psychology

• Public Administration

• Sociology

• Statistics

• Zoology

hope you found this useful