Dear chetan,
Going thru several books without grasping much doesnot make any sense. Rather you have to be selective in your approach.
The point is you have to study thoroughly whatever you are studying and study with full commitment and dedication.
Askiitians studymaterial provides you a good source of study material.You can trust it.
We are all IITians and here to help you in your IIT JEE preparation.
All the best.
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Sagar Singh
B.Tech IIT Delhi