JEE Advanced

Hi Priyanshu,
It is good to hear that you have such a high ambition in your career. You should understand the basics of physics, chemistry, mathematics and computers that you will be learning in class 11th and 12th.
You should ensure that your marks are above 80% in class 12th board examinations. Along with these, you also need to prepare for competitive exams. Books for preparations for IIT-JEE / AIEEE are easily available in the market. It is recommended that you can join a good IIT coaching institute as well. They will help you to understand the concept better.
Then, you need to apply and appear for IIT-JEE Mains and IIT-JEE Advanced after completing your class 12th board examination and score good. I wouldn't recommend dropping a year or so after class 12th board examinations for preparations for competitive entrance examinations.
However, I would also advise you to appear for other entrance examinations as well. This serves as a backup plan, if things don't end up as per you had planned. You should also appear for AIEEE and state level examinations (COMEDK for Karnataka, EAMCET for Andhra Pradesh / Telangana, OJEE for Odisha, etc.).
I hope it helps. If so, kindly upvote this answer. In case you have any further questions, feel free to revert.

Hi,
Following are the best books for chemistry:
Organic Chemistry by Morrison and Boyd for Organic Chemistry
Organic Chemistry by Solomons and Fryhle for Organic Chemistry
A Guidebook to Mechanism in Organic Chemistry by Peter Sykes for Organic Chemistry
This book must be read irrespective of whether you read 2 or 3. But, it is suggested that you read this book only after you have covered all or at least a large part of your organic chemistry syllabus.
Concise Inorganic Chemistry by J. D. Lee for Inorganic Chemistry
[Practice] Modern Approach to Chemical Calculations by RC Mukherjee
Following are the best books for mathematics:
The elements of coordinate geometry by S.L. Loney
Plane Trigonometry by S.L. Loney
Higher Algebra by Hall and Knight
(Do not use these three books for theory. They are quite old-fashioned.)
Problems in Calculus of One Variable by I.A. Maron
[Practice] Course in Mathematics for IIT-JEE by Tata McGraw Hill publications
Following are the best books for physics:
[Practice] Concepts of Physics by H. C. Verma
[Practice] Problems in General Physics by I. E. Irodov
This is generally of a level above the general questions asked currently in IIT-JEE and may be considered optional.
Fundamentals of Physics by Halliday, Resnick and Walker
Note that I have tried to create an exhaustive list. You are not expected to buy them all. However, it is important to solve problems from as many books as possible. On the contrary, it's better to read theory from say one or two books or at most three.
I hope this helps you.
All the best!