i do English History Latin and Maths and I found having an exercise book per teacher (9 in total) at school and taking them home and writing everything up on A4 paper at home, so I have two copies of everything and putting these written up notes in separate ring binders for each subject, (as well a completed homework folders). I find this to be great because by writing everything up, you’re looking over everything again, and revising even if it is a bit tiring having to copy everything up - but it helps for exams because you don’t have to do it during exam season and you can work on condensing them even further ! - this isn’t really necessary for maths tho, my teacher just made me write formulas on the front of the exercise book and stopped us from writing notes because she said you either know it or you don’t!