Read the following 10 books to start -

1) Indian History and Culture - V.K Agnihotri

2) India's Struggle for Independence - Bipan Chandra

3) Indian Polity - M Laxmikant

4) Introduction to the Constitution of India - D D Basu

5) Physical and Human Geography - Goh Cheng Leong

6) Geography of India - Majid Hussain 7) Environment & Ecology: Biodiversity, Climate Change and Disaster Management - Majid Hussain

8) Indian Economy - Dutt & Sundaram OR Mishra and Puri

9) Indian Economy - Ramesh Singh

10) Indian Foreign Policy - Rajiv Sikri