If you are looking for dedicated video lectures for JEE Physics and Chemistry by top faculties, try- Aakash Etoos Vedantu Physics: • Concepts of Physics Vol. 1 and Vol. 2 by H.C.Verma • Fundamentals of Physics by Halliday, Resnick & Walker • IIT-JEE Physics, Understanding Physics (5 volumes) by DC Pandey • Problems in General Physics by I.E. Irodov • Aptitude test problems in Physics by S.S.Krotov Chemistry: • Modern Approach to Chemical Calculations by R.C.Mukherjee • Organic Chemistry by Paula Bruice Yurkanis • Organic Chemistry by Morrison & Boyd • Organic Chemistry- Solomons Fryhle • Organic Chemistry- MS Chouhan • Numerical Chemistry by P. Bahadur • Inorganic Chemistry by J D Lee • Physical, Organic & Inorganic Chemistry by O.P. Tandon • Physical chemistry- N Avasthi • NCERT – XI-XII Chemistry

You Can try for Video lectures Nucleon BJYU’S Frankly, I feel that YouTube is a very big distraction, we might start seeing different videos and lose our path. So YouTube should never be used for watching videos.

Khan Academy is a free learning site for a variety of subjects including physics and chemistry. If you looking for dedicated IITJEE online videos, BYJU's, Unacademy and even conventional coaching centers such as VMC are offering online lectures to students. However, the latter websites are paid services, unlike Khan Academy.