Try to use information from all the resources you've been given in order to complete your notes (and ultimately have all the info you need to revise) - this means use your class notes, your textbook, handouts, YouTube videos, diagrams... All that sort of stuff which you can use to create a 'bank' of information. It's a lot easier to revise when it's all in one place!
When you come to revising, find a method that works for you to actually understand
what you're looking at - I've found it too easy to read and memorise facts without actually knowing how it all links together, meaning that ultimately I just forget it. For me, I've been working on fixing this by making mindmaps where I can visually see what parts of the topic are related. For you, it might be flashcards or revision videos that will make the topic 'click' in you brain.
If you don't undertand something, please ask someone
! Whatever it is, it's not a stupid question if it's going to help you to do better
(I've found one-to-one revision sessions really helpful).
Lastly, I would say that you shouldn't give up all your hobbies just to get extra revision time for your exams. We all need a break at some point, and if it's something you enjoy (if your experience is anything similar to mine) it will help you be less stressed overall!