The market is flooded with many books of IIT - JEE . The time u get is very short and so selection of the best books is very essential . I recommend u some of the books topic wise which I found useful .

Physics :

1. Mechanics ( Cengage physics by B.M. Sharma consists of two volumes , and D.C. Pandey for only gravitation )
2. Waves and Thermodynamics (D.C. Pandey )
3. Electricity and Magnetism ( D.C. pandey and Cengage physics by B.M. Sharma )
4. Optics and Modern physics ( Cengage physics B.M. Sharma )
5. Then have a look at H.C. Verma
6. 36 years previous years IIT JEE papers by D.C. Pandey
7. Irodov (selected problems ) and Advanced problems in school Physics (do if u have time , generally this book requires rigorous knowledge . Do not waste time on all problems . Selected problems may be done .)

Maths :

1. Coordinate Geometry ( by S.K goyel , Arihant publications , practice and learn all types of formulas present in the book)
2. Calculus ( Differential calculus and Integral Calculus by Amit M Agarwal )
3. Play with graphs ( by Amit M Agarwal)
4. Algebra ( S.K goyal )
5. Trigonometry ( Amit M Agarwal )
6. 3-D geometry ( Amit M Agarwal )
7. 36 years previous solved IIT JEE papers by Amit M Agarwal
8. Allen distance study materials

Chemistry :

1. Comprehensive Chemistry ( 2 volumes , read thoroughly )
2. For physical chemistry I recommend book by Ranjeet Shahi
3. For organic chemistry I recommend Ranjeet Shahi and videos from Youtube and practice problems books by Himanshu Pandey .
4. For Inorganic I recommend the book by sudarshan guha ( must read chemical bonding , coordination chemistry )
5. Further I suggest u to collect the distance learning material of Allen . 90 % of the chemistry books contains all the required concepts and problems .
6. 36 years solved IIT JEE chemistry by Ranjeet Shahi .

Hello Akshay

You can download our E-book link is given below

https://engineering.careers360.com/download/ebooks/know-all-about-bcece

 Also you can study through  NCERT Physics, chemistry,biology and mathematic book of Class 11th and 12th.

You can solve Previous years objective questions of jee main and jee advanced(AIEEE and IIT)

Or you can buy this book BCECE Explorer by MTG or BCECE by Arihant

All the best!