Dear Nitin,

Check out the best books in links: http://www.askiitians.com/Important-books-iit-jee.aspx 

These books are quite good and sufficent for building concepts .

Please feel free to post as many doubts on our discussion forum as you can.
If you find any question Difficult to understand - post it here and we will get you
the answer and detailed  solution very  quickly.

We are all IITians and here to help you in your IIT JEE preparation.

All the best.

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Regards

Vijay Luxmi

For concepts , best books are

HC VERMA physics ,

NCERT chemistry ,

M.L. Khanna Mathematics .

Concepts are very important in iit , when u complete them do revise them again because to apply them u require speed calcuulations which comes only when every concept is in ur heart .

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I suggest following books for IIT JEE preparation: Physics MECHANICS Physics by H.C. Verma Problems in physics by I.E. Irodov Resnick and Halliday ELECRICITY AND MAGNETISM Resnick and Halliday Circuits devices and systems by R.J. Smith Problems in physics by I.E. Irodov OPTICS Physics by H.C. Verma MODERN PHYSICS Physics by H.C. Verma Problems in Physics by I.E. Irodov HEAT AND WAVES Physics by H.C. Verma Resnick and Halliday Chemistry ORGANIC CHEMISTRY Morrison & Boyd Solutions to Morrison Boyd Reaction mechanism in Organic Chemistry by Parmar ∓ Chawla INORGANIC CHEMISTRY NCERT Inorganic Chemistry Concise Inorganic Chemistry by J.D. Lee IIT Chemistry by O.P. Aggarwal GENERAL CHEMISTRY J.D. Lee O.P. Aggarwal R.C.Mukerjee Maths ALGEBRA High school mathematics by Hall and Knight IIT Maths by M.L. Khanna CALCULUS amp; ANALYTIC GEOMETRY G.N.Berman Calculus and analytic geometry by Thomas and Finney Coordinate geometry by Loney IIT Maths by M.L. Khanna I.A.Maron VECTORS IIT Maths by M.L. Khanna