Well it depends on which college you are studying right now, it's curriculum, teaching environment and lots of other factors also do count.
And we all know that jee syllabus comprises of 11 and 12th grade subjects which pcm and you'll also have to study them in your entire first year of Engineering, so attend classes of your college, ONLY NECESSARY ONE'S because we all know nothing special is taught in Indian engineering colleges, so choose wisely and devote your free time in solving sample papers and also clear your basic concepts related to each subject.
You'll learn everything theoretical in your college so be practical in your preparations, and stay focused.
Best wishes for your future endeavors thank you.

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