Important Books for Preliminary Examination
General Studies
1. Geography - NCERT 6 to 12th std
2. Indian Polity - Laxmi kanth
3. Governance in India - Laxmi Kanth
4. General Science - NCERT 9 and 10th std
5. Brief History of Modern India - Rajiv Ahir
6. Indian Struggle for Independance - Bipan Chandra
7. Economic Survey - Ministry of Finance
8. Hindu Newspaper, Frontline Magazine and Pratiyogita Darpan
CSAT
1. Quantitative Aptitude - R.S Agarwal
2. Verbal Reasoning - R.S Agarwal
3. Fast Track Objective Arithmetic - Rajesh Verma
4. Reading Comprehension - Wren and Martin
All the Best...