Reading List for Political Science 
1. The Constitution of India-D.D. Basu
2. An Introduction to Political Theory-O.P. Gauba
3. The Constitution of India-P.M.Bakshi
4. Political Theory-Amal Ray, Mohit Bhattacharya
5. Comparative Politics-Ronald Chilcote
6. Our Parliament-S.C. Kashyap
7. History of Political Thought-Subrata Mukherjee, Susheela Ramaswamy
8. A History of Political Thought-J.P. Suda, Foundations of Indian Political Thought-V.R. Mehta,                     Modern Political Theory-S.P. Verma
9. Western Political Thought-R.M. Bhagat
10. Andrew Heywood-Politics
11. Andrew Heywood-Political Theory:
12. An IntroductionComparative Politics-J.C. Johari
13. History of Political Thought- George Sabine
14. Politics among Nations-Hans Morgenthau

A few tips:1. Look up Wikipedia for the latest on world constitutions
2. Combine preparation of Section B of Paper 1 with Indian Polity and History in GS
3. Update your Paper II Section B answers with GS Paper II notes on India and the World and International Organizations
4. Take a look at the Delhi University B.A./M.A. Political Science syllabus/reading lists for references on International Relations