Dear Resham
In IIT JEE exams emphasis is more on the understanding of concepts rather than rote learning and memorizing of formulae. So read good book and be attentive. Do one or two book only for each subject but revise them regularly. Revision is very important to secure good marks. so don't run after too many books and material. You can use following books for the preparation.
Mathematics:- RD Sharma and Arihant Books, NCERT
Physics H. C. Verma, NCERT. D C PANDEY
Chemistry
NCERT AND

P. Bahadur - Physical Chemistry 
Arihant Publications - Organic Chemistry 

O.P. Agarwal - IIT Chemistry - for Inorganic Chemistry
 
All the best.
AKASH GOYAL
AskiitiansExpert-IITD
 
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