Hello,
I did Biology A level SNAB edexcel (such a horrible exam board)
I recommend using YouTube videos for processes to help visualise such as in year 12 the clotting cascade and writing step by step out again and again.
what really helped me was blurting, blurting helps you with what you can and cannot remember as well as what you need to work on.
my school bought us CGP textbooks and range other textbooks - I did use them for notes and references. But it's really important that you dont use your CGP book as a guide to your learning as some parts of the book you dont need to know or is extra information. To help you with exactly what you need to know use your PLC (personalised learning checklist). Your school should supply this to you or you can just search up the specification.
Write your flashcards during lessons, it saves time so you will less likely fall behind and review your lessons in your frees, ask your teacher for the powerpoint and go through it so that your confident in the next lesson. ask your teacher if you still dont understand.
Uplearn is useful, they dont have edexcel snab but some content from aqa overlaps with our topics.