DDC to A*A*A* in two months, how do i actually revise?!

hi guys! i need your best advice 😭
so i do OCR A biology OCR A chemistry and AQA psychology, and in my mocks i got DDC respectively. the problem is i need A*A*A and i know that sounds really ambitious, but im willing to work hard for it in the next two months.
but the issue is that i don't know how to work for it, which is what i need help with
ive never really revised for anything in my school life, and until now i didnt really pay attention in lessons. i managed to survive gcses with mostly 9s 8s and some 7s. for the year 12 exams i got AAE (the E was in chemistry) so i dont really know what method works best for me
ive only been focusing on chem so far, psych will be fine for closer to the exams i think- but i am also very scared for bio as there is SO much content and i don't even know how to learn it
what ive tried so far:
- reading PMT/save my exams notes - this is my go to strategy but as you can see i don't think it's been very effective...
- watching yt videos - i tried machemguy for chemistry, it was okay but i feel like i forgot everything afterwards
what i want to try:
- past paper questions and exam papers
the issue with this is that i need to actually learn the content first
my plan so far:
- do AS papers for the next week or two until i get 90%+ (my teacher told me to do this last year and i regret not doing it then)
- start from the beginning, module 2? do you think thats a good strategy
in regards to time, i have frees and studies in school and lunchtime too, i think we're finishing chem+psych content in the next week or two but we are behind in bio and will probably finish after easter. another side thing is im not sure if i should quit my part time retail job, on one hand it will free up my weekends but on the other hand i like the money (its minimum wage though and at a place with very bad employee reviews, jewelry store for reference) and also maybe it would help my time management? i don't have any time management though,would it help to make a schedule?
im interested in trying spaced repetition but theres just so much i need to learn its overwhelming. oh and also i want to buy a mini whiteboard to use for revision lol
so if anyone has any advice how to learn the content very fast for my subjects or personal experience, please let me know!!! i will appreciate it so much, im finally ready to take responsibility!!
thank you 🫶