How to revise for graphic communications higher?

No joke I get nothing in class, I have no idea how to study for it either, my teachers not much help and I don't know what to do at all. Last year I read the textbook the day before and did a few questions and got an A but this year I did that during prelims and I got a C so I'm really falling behind. I really need an A this year aswell
Pls help
Teach me how to study or what resources to use to help me study so I can get an A

Is there a specification you can follow? Or perhaps past papers to apply your revision techniques?
Here's something I like to do:
Prepare - plan out revision schedules + gather materials
Transform - making my own notes and summarising it in a way I understand
Cover and check - basically testing yourself if you've memorised all your notes
Apply - PAST PAPERS are your best friends!!
Review - find out which topics you still struggle on
Then repeat the cycle until everything is memorised!!
Goodluck with exams, I wish you all the best.