Sir what are the important topics or chapters of 11th class from which most of the time question comes?
Are you asking for JEE Main? I would suggest you to check the syllabus of the exam to go through with the given below link.
Also I would like to inform you that Careers360 is conducting All India Talent search Exam where students of 11th and 12th PCM/PCB ( Engineering or Medical) can test their knowledge and enhance their preparation by knowing their stronger and weaker areas and win prizes and scholarships worth ₹1.25 Crore.
Avail this opportunity (Scholership and Exciting Prizes - ₹50,000/- cash Prizes, Upto 100% Scholarship on JEE / NEET AI-Based preparation packages, Laptops, Smartphones, Amazon Echo, Careers360 Almanacs, Powerbanks, Upto ₹250/- Paytm *Cashback offer)
Topics you should revise in Physics, Chemistry and Mathematics are given below :
Units and dimension
Sets and relations
Hope this helps .