Reference Books

Indian History :

NCERT Books for Stds. 10th, 11th and 12th (Ancient, Medieval and Modern India) - Old and New.
India's struggle for Independence - Bipan Chandra
Modern India - Grover and Grover
Modern India - S. N. Sen
Modern India - Spectrum Publication

Geography :

NCERT Books for Standard 6th to 12th
Certificate Physical Geography - Goh Cheng Leong
India Yearbook (Publication division)
for relevant statistical data
Atlas (Standard) to study maps
Pratiyogita Darpan and Wizard special issues.

Indian Polity :

NCERT Books for Standard11th and 12th
Our Parliament - Subhash Kashyap
Our Constitution - Subhash Kashyap
Introduction to the Constitution of India - D. D. Basu
Indian Constitution - P. M. Bakshi

Indian Economy :

Evolution of Indian Economy - NCERT books
Indian Economy - Dutta and Sundaran
Economic survey of India
Special issues of Pratiyogita Darpan
Chronicle - “Economy Watch Section
ET classroom and special articles from Economic Time

General Science :

NCERT Books for Standard 5th to 10th
Tata McGraw Hill (TMH) Guide
Science Reporter

C-SAT :

Mental Ability - R. S. Agarwal
Competition Success - Intelligent Test - W. N. Dandekar
Ultimate In Mental Ability Test - Lt. Col. M. G. Diwan
Quantitative Aptitude for CAT - Arun Sharma
Word Power made Easy - N. Lewis
How to read better and faster - Lewis
Puzzles - S. Devi, George Summers
Non Verbal and Logical Reasoning - R. S. Agarwal
Quantitative Aptitude - R. S. Agarwal
C-SAT Manual 2011 - Pearson
C-SAT Manual - Tata McGraw Hill (TMH)

Current Affairs : Newspaper

The Hindu, Times of India, Indian Express, Maharashtra Times, Any Marathi Newspaper

Current Affairs : Magazine

Civil Service Chronicle
Wizard (Special Issues)
Pratiyogita Darpan (Special Issues), Frontline
Yojana, Kurukshetra,
Lokrajya, Science reporter, Down to Earth

Topics of Social Relevance :

Idea of India - Sunil Khillan
Indian Society - S.C. Dube
Problems in India - Ram Ahuja