1. Current events of national and international importance - In this you have to cover current affairs which are important for India's Economy, Geography, Science and Tech etc
2. History of India and Indian National Movement - Ancient Indian history, Medieval and South Indian history, and Art culture will be covered.
3. Indian and World Geography - Physical, Social, Economic Geography of India and the World. You have study Geogrpahy with the mapping also.
4. Indian Polity and Governance: Constitution, Political System, Panchayati Raj, Public Policy, Rights Issues, etc. And Current Affairs Related to these Topics
5. Economic and Social Development - Sustainable Development, Poverty, Inclusion, Demographics, Social Sector initiatives, etc. And day to day updates from RBI and Imp institutions
6. Environmental Ecology, Biodiversity & Climate Change - General Issues. All these issues should cleared by students in Preliminary Exam.
7 . IN General Science basically included biology,chemistry, Physics, Defense Tech, Space Tech, Nano Tech, and other important technological discoveries.
All of these topics are asked in the preliminary Examination of UPSC CSE. Check these topics in details if you want to prepare of the Government jobs.