The first thing which you need to do is clear all the concept which the teacher teaches. Besides that you have to do many MCQs , objective questions , numericals and many more. You need to buy advanced

Very important books for IIT jee beginners Physics: HC VERMA PART 1 AND 2 DC PANDEY SERIES RESNICK HALLIDAY KRANE (BIBLE FOR BASE CREATOR) BM SHARMA IE IRODOV BOOK OF PROBLEMS CHEMISTRY: NCERT CLASS 11