If you wish to know the history of India before the arrival of the Brits, please read books written by the great Indian historian Dharmapal. He uses excellent reference material to support his arguments. His books are out of print but you can download them for free from this website: MultiversityLibrary.com
You have to make a request and they will send the link to download the material to your email. Please access the link by the 72 hours deadline or it expires.