Questions from history subject are being asked in both the Preliminary and Mains stages of the Civil Services Examination. If you are also an IAS aspirant, then you must look at history as an optional subject.
History of Modern IndiaBy Bipan Chandra
India’s Ancient PastBy RS Sharma
NCERT History Books
India After GandhiBy Ramchandra Guha
History of the WorldBy Arjun Dev
Ashoka and the Decline of the MauryasBy Romila Thapar