Hey,
As only forty days are left for the exam, then try to focus on previous years papers. Work on your time management skills. The materials provided by the your coaching can also be referred to. And most important of all,try to have faith in yourself and your preparation.
You can also refer below recommended books for your preparation
Mathematics:
Make sure you can solve problems from the NCERT class XI and class XII textbooks.
For best concepts, use IIT Mathematics for JEE (Main and Advanced) by M.L. Khanna
For the most abundant supply of difficult questions: New Pattern IITJEE Mathematics by Dr. S.K. Goyal
Plane Trigonometry and Elements of Coordinate Geometry by S.L. Loney

Physics:
Concepts of Physics, Volumes 1 and 2, by H.C. Verma
Problems in General Physics, by I.E. Irodov
Fundamentals of Physics, by Halliday, Resnick, and Walker
Understanding Physics for JEE Main and Advanced (series), by D.C. Pandey
Chemistry:
Study the NCERT chemistry textbooks for classes XI and XII.
Organic Chemistry, by Morrison and Boyd
Numerical Chemistry for JEE Main and Advanced, by P. Bahadur
Concise Inorganic Chemistry, by J.D. Lee
Modern Approach to Chemical Calculations, by R.C. Mukherjee
Physical Chemistry, by P. Bahadur. organic, physical, and inorganic chemistry books by O.P. Tandon
Hope this helps.
Good luck.

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