Hello Kabir Jain,

I would like to tell you to don't worry and keep working hard as time is there and you can score very well.

Here are some of the best books mentioned by the toppers mentioned at careers360's given below:

PHYSICS

• Concepts of Physics-H. C. Verma
• Fundamentals of Physics-Halliday, Resnick, and Walker
• Problems in General Physics-I. E. Irodov
• University Physics-Freedman and Young
• Understanding JEE physics series-DC Pandey
• Problem In Physics-SS Krotov

CHEMISTRY

• Modern Approach to Chemical Calculations-RC Mukherjee
• Organic Chemistry-Solomons and Fryhle
• Concise Inorganic-J. D. Lee
• Organic Chemistry-Morrison and Boyd
• University Chemistry-Freedman and Young
• Physical Chemistry-N Awasthi
• Arihant's Practice Book Chemistry for JEE Main And Advanced-R.K Gupta

MATHEMATICS

• Higher Algebra-Hall and Knight
• Coordinate Geometry-S.L. Loney
• Differential and Integral Calculus-N. Piskunov
• Calculus and Analytic Geometry-Thomas and Finney
• IIT Mathematics for JEE Main & Advanced-M.L. Khanna
• Course in Mathematics for IIT-JEE-Tata McGraw Hill publication
• Problems Plus in IIT Mathematics-A Das Gupta
• Trigonometry-S L Loney

For more detailed info about the tips and tricks, visit the careers360's link given below.

The link is:https://engineering.careers360.com/articles/best-books-for-jee-main-2019

hope this helps and all the very best!