Hello Shivaraj,

Here are a few books you can refer for Modern Indian History-
1. Adhunik Bharat Ka Itihas by Bipan Chandra, 2001
2. India's Struggle for Independence, 1988 by Bipan Chandra
3. Modern India Spectrum by Rajiv Ahir
Books for Karnataka History:
1. History of Karnataka by Ranganath
2. Splendours of Royal Mysore  by Vikram Sampath
3. A History of South India: From Prehistoric Times to the Fall of Vijayanagar, by K.A. Nilakanta Sastri

Hope this is helpful. :)