I'm y11 right now, and all I can say is make sure you know how to revise.
im a little over 20 days away from my first actual GCSE (spanish aural) and I've done absolutely nothing for it, because i dont know how to revise + 0 motivation or determination. its not because i dont have notes, though, and if im honest ive used about 10 percent of all the stuff ive written in my textbooks when i have done any revision. personally I don't feel that notes are as essential to have but instead just have a consistent method of revising, because you can have all the notes in the world and not utilise them due to having no clue on how to use them effectively.
especially if you're happy with how youre doing now and are getting good grades, it may not be worth changing how you work