Hello Sarosh,

Yes, may be as you say, but you should not depends on that. Your basics in Physics, Chemistry & Mathematics should be very clear upto 12th std, you should read NCERT books of Physics, Chemistry & Mathematics of class 11th & 12th at least 2 or 3 times for basics. After that you can go through your study material or HC Verma for Physics, RD Sharma for Mathematics, OP Tendon for Physical & Inorganic Chemistry, and Organic Chemistry of "Arihant Publication" for detail or extra knowledge.

For more best books for the preparation of WB JEE or JEE Main & Advanced also, you may go through the link given below

Https://engineering.careers360.com/articles/best-books-for-jee-main-2019

You should also try to solve the previous years question papers, this helps too much and you should also give the mock test to rectify yourself and build your confidence level.

For preparation of exam, the most important thing is your confidence after that you should know the whole syllabus and make your plan properly for learning new chapters, solving the numericals and revision. All three things should be the part of your preparation strategy in daily routine.

Thanks for query

All the best