For JEE MAINS you can follow the youtuber Teachers as stated below:

For Physics you can follow Physics Wallah, Physics Galaxy and the all time famous classes by Sir Walter Lewin.

For Chemistry you can follow Ajnish Gupta , Sachin Rana, Aman Dhattarwal

For Mathematics I will recommend Mohit Tyagi Sir only.

I hope this might help. All the very best for your future endeavors!