Answer:
History, Geography, Political Science / Civics, Economics, General Science - Physics, Chemistry & Biology, Environmental Science and Sociology.
Step-by-step explanation:
History, Geography, Political Science / Civics, Economics, General Science - Physics, Chemistry & Biology, Environmental Science and Sociology are the subjects you have to learn for UPSC exams. If you learn these subjects properly you will be able to pass the examination with good percentage. UPSC examination is conducted in three phases, the first one is General Studies Paper I and second one is General Studies Paper II also known as CSAT, and a main examination comprise of nine papers.