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Hi Shewta,
Below mentioned are the books that you can consider:
A. Paper I - General Studies
1. History (Indian History and Indian National Movement)
Essential:
NCERT books IX, X, XI, XII
Modern India by Bipin Chandra.
2. Geography (Indian and World Geography)
Essential:
NCERT books IX, X, XI, XII
General Principals of World Geography by Charles Farro.
School Atlas.
3. Economics (Indian Economics and Economic Theory)
Essential:
An Evolution of Indian Economy by I.C. Dhingra.
Economic Survey of India by Government of India.
Economic Dictionary by Penguin.
4. Polity (Indian Constitution)
Essential:
An Introduction to the Constitution of India by D.D. Basu.
5. General Science (Physics, Chemistry, Biology)
Essential:
NCERT books IX, X
6. Environment (Ecology, Bio-diversity, Climate Change)
Essential:
Biology and Geography NCERT Books plus current events on Environmental Issues.
7. Current Affairs
Essential:
Hindu and Economic Times Newspapers.
Front line, Political & Economic Weeks Periodicals.
B. Paper II Aptitude
C.
1. NCERT Mathematics VII, IX, XI
2. Data Interpretation and Data Sufficiency by Tyra and Kundan.
3. Objective General English by R.S. Agarwal.
4. A Modern Approach to Verbal Reasoning by R.S. Agarwal.
5. A new Approach to Reasoning by Sijwali and Sijwali.
For more information you can refer to the below mentioned links:
http://www.upsc.gov.in/exams/notifications/2013/csp_ifs/csp2013.pdf
https://www.shiksha.com/getArticleDetail/192/Civil-Services-Entry

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