Hey!

To start your preparation for UPSC Civil services /IAs exam you must start by NCERT books. And  then go through the referred standard books. Most standard books for history are

• History of India and Indian National Movement -Spectrum’s A Brief History of Modern India, by Rajiv Ahir, India’s Ancient Past, by R.S. Sharma, A history of Medieval India, by Chandra Satish, etc.

Thank you.