Greetings !!

You may refer NCERT official site,  NCERT Ancient Indian History Book is provided in PDF form so that students can access it at anytime anywhere . I recommend you to visit Unacademy , Byjus IAS sites and channels you will be getting ample of worth reading PDFs related to Indian Ancient history. If any doubts, pls feel free to ask.

Wish You Good Luck !

Thank You !!