Swathi

1. Current events of national and international importance
2.  History of India and Indian national movement
3. Indian and World Geography- Physical, Social, Economic Geography of India and the world
4. Indian Polity and Governance – Constitution, Political system, Panchayati Raj, Public Policy, Rights issues,         etc.
5. Economic and Social development – sustainable development, poverty, inclusion, demographics, social sector initiatives etc.
6. General issues on environmental ecology, Bio-diversity and Climate change-that donot require subject specialization
7. General science

This is prelims gs paper 1 syllabus 

Go to www.upsc.gov.in website .. you can find all the details here

First start with ncert for basics complete all NCERT within 2 months and then start with standard books.. complete your prelims and mains syllabus.. don't study prelims and mains separately it will take lot of time. Read newspaper daily, read magazines monthly current affairs .. write test series know your potential revise the syllabus for atleast 5 times..