Hi Jharna

I will write about the books I used. Note that I mostly relied on books and self study.

IIT JEE Books | Best Books for Jee Main Physics

BOOK-AUTHOR

Concepts of Physics (Part I)-HC Verma

Concepts of Physics (Part II)-HC Verma

IIT JEE Physics-DC Pandey

Problems in General Physics-I.E. Irodov

Physics for IIT-JEE-Resnick, Halliday, Walker

Problems in Physics-S.S. Krotov

IIT JEE Books | Best Books for Jee Main Chemistry

BOOK-AUTHOR

Organic Chemistry-Morrison Boyd

Organic Chemistry-O.P Tandon

Modern Approach to Chemical Calculations-R.C. Mukherjee

Numerical Chemistry-P. Bahadur

Concise Inorganic Chemistry-J.D. Lee

IIT JEE Books | Best Books for Jee Main Mathematics

BOOK-AUTHOR

IIT Mathematics-M.L. Khanna

Differential Calculus-A Das Gupta

Class XI & XII Mathematics-R.D. Sharma

Trigonometry, Geometry Books-S.L. Loney

Problems in Calculus of One Variable-I.A. Maron

Higher Algebra-Hall and Knight

Hello Jharna, 

You can refer the following books:

For Physics: “If you want a strong command on these topics (Mechanics, Electricity & Magnetism,Optics)which are the most frequently asked topics of JEE (M)”. You can refer D. C Pandey by Arihant Publications .

Or The Famous name in Jee Preparation --H. C Verma.

For Chemistry : Organic Section-Himanshu Pandey, M. S Chauhan. I would say that M. S chauhan is far better than Himanshu Pandey as it contains all types of questions.

Inorganic: “NCERT" Books are the best. If you still want more you can go for Inorganic Chemistry by Dr. O.P Tandon Dr. A. S Singh.

Physical Chemistry :Start from NCERT as basics are cleared there.. Then you can move to Dr. O.P Tandon.

For Mathematics : Start With NCERT then go for (1)Fundamentals of Integrals Calculus by Vikas Rahi.(2)IIT Mathematics by A. Das Gupta.(3)Tata McGraw Hills or TMH Jee Mathematics..

TIP:Start Slow,clear your concepts with the help of your teachers and friends... and keep on solving previous year papers to be on track.. Best Wishes

Hope This Helps...