Looking for a good online tutor/course for Class 11 & 12 Science (NEB) that's actually worth the money

I recently started Class 11 (Science), and I am already struggling to keep up, especially with Physics, Chemistry, and Maths.

The teachers at my school mostly write notes on the board, tell us to copy them, and move on without really explaining the concepts. Since I don't have a strong foundation yet, I am finding it really hard to understand what's going on.

I am looking for an online tutor or a paid course that's genuinely worth the fees. My priorities are:

• Physics
• Chemistry
• Mathematics

If it also includes Computer Science, that's a huge bonus, but my main focus is PCM.

I am looking for something with clear concept-based teaching, good notes, regular classes, and preferably doubt-solving as well. I don't mind paying if the teaching quality justifies the cost.

If you've personally used any platform or tutor that helped you score well or actually understand the subjects, I would really appreciate your recommendations. It would also be helpful if you could mention what you liked (or didn't like) about it.

Thanks in advance!