Some of the best channels that I have used during my preparation are,
Physics –
1) Physics Galaxy (Ashish Arora Sir)
2) Physics Wallah (Alakh Pandey Sir)
3) Sachin Sir Physics
Chemistry –
1) Dushyant Kumar Sir (Helios Educore) for Physical and Inorg. Chemistry
2) Vineet Khatri Sir (ATP Star) – Org. Chemistry
3) Sachin Rana – Org. Chemistry
Biology –
1)Vipin Sharma (Ozone Classes)
Just like everything in this world YT have positive and also lots of negatives in it. To get best out of it, focus only on watching the content that will help you grow and succeed in your preparation.
I have discussed in detail on how to use these channels and how to get maximum out of these in this video, you can check it out too 🙂