Gcse study help

I have a few questions. I’m on mostly 6s (a B). I didn’t revise much for the mocks. In two and a half months, is it possible to get 8s ( an A*) with a lot of revision? That’s my target so that’s why I ask.

Also, what is the best way to revise? I have bought cgp books for almost every subject, and I buy a5 notepads for each paper in the GCSEs eg. An a5 book for chem paper 1 , another for paper 2, and then I write notes .The only notes I’ve fully wrote from the guides are all of chemistry, some of physics and that’s it. I’m unsure if this is a good way to revise. Should I carry on doing this with every other subject - I feel comfortable doing this but I’m unsure if it’s effective enough. I tried to do other methods ie flash cards, but I was unsure exactly what to write on these flash cards. And mindmaps don’t appeal to me tbh. Since I have two full a5 books on chemistry I’ve spent like 8 hours on, what do I do with these? Just read over them? If I make flash cards, then on what? I’m unsure what I’m meant to write since I’ve already written any info needed in these books.

So basically I’m asking, is writing a full a5 book of notes for a paper effective? What do I do after i’ve written an entire notebook worth of notes? Just read over them? And if I make flash cards, what do I write on them? And also, is an 8 achievable with heavy revision? And if you could name any other revision methods to help get these grades that’d help.

Any help is appreciated.