Sir where should I study chemistry for preparing for jee mains

I would suggest you to self study .

Or if you want to go for any coaching just go through demo classes for a days so you could grab a teaching way .it's not all time about subject it is sometimes about teacher too .

Go through your intermediate syllabus of chemistry study yourself give..3 hrs regular to this subject at starting to clear your basics .

Go through ncert books first and then go with different books and authors solve previous years question papers of chemistry . Clear your basics you will be having fun with this subject.

Please manage your time while preparing for jee exams .

Good luck.