Hlo;
I will suggest you to first go through NCERT. First read NCERT of all three phy, chem,math. Underline everything you read and thought it is important and then for physics ,
HC VERMA is a must book with interesting and good no. of questions. since you have much time for preparation, so if yu complete hc verma,then go for IE IRODOV for practice. And that will be more than sufficient
Coming to chemistry,
For inorganic, ncert is enough!
For organic , try solomons and frehyle's organic chemistry
For physical, RC Mukherjee is best! Also try numerical chemistry by P Bahadur.
And for maths,
RD sharma  class 11-12 is a very good book.
Arihant series and cengage series are other good books.
Also buy arihant past year solved question papers book.
While preparing for any chapter, check out what type questions generally come from this chapter. Yu should not feel sad etc. If yu could not solve previous questions. Believe me, after practicing enough from above books, yu will be able to solve any question.
Thanks,
Wish yu all the best for yur preparation!!

Firstly I would suggest you to go through well with NCERT books then prfer other books for the preparation:

Physics-

HC Verma (both volume 1 and 2)

Disha-problems in IIT JEE.

Chemistry-

Chemistry by P. Bahadur .

Concise Inroganic Chemistry by J.D. Lee.

Mathematics-

Trigonometry by S.L Loney

Higher Algebra by Hall and Knight

 

Good Luck!

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