is NCERT enough to preparation for IIT mains
Hello student to be honest NCERT is not enough as there's no much question for practice. Prefer NCERT to build your basic concept and make sure you do each and every example and exercise questions of Ncert before jumping to a reference book. After completing ncert thoroughly refer to your coaching materials or reference book as mentioned below -
Concept of physics by HC VERMA
OP TONDON CHEMISTRY
Rd Sharma Mathematics
Arihant practice book for Jee main.
Feel free to comment if you have any doubt
Good luck