Revision help with AQA Triple Science

I have my science GCSES in May and June and I'm desperate to get A*'s in all three. I got A*'s in my mocks. But I have been revising recently using a lot of past papers from the website and CGP papers and I'm not doing very well. I got 50/60 in one of the B1 CGP papers but the grade boundary for them is 51 and in a recent B1 CGP paper i only got 42 which is equivalent to a B according to their boundaries, it was my worst mark out of all the B1 papers I have done but it was also the most recent after looking over my mistakes in the previous papers. I just can't seem to get secure A*s and now i'm panicking a lot and can barely concentrate on other subjects. please tell me what I'm doing wrong because I look over all my mistakes and reading over them in textbooks and seem to understand them but I'm not improving and I'm running out of time and papers.

But what's the point of redoing papers? I'll probably remember the answers and I don't get second chances at my actual GCSE. And another thing I redid a Chemistry paper in which i got 42/60, the second time I got 57/60. But i'm not consistently getting 57/60 in Chemistry papers at best I get is 53 sometimes and in the CGP ones, which have really high grade boundaries i barely scrape an A*.

But the AQA mark schemes seem to be ridiculously specific about what they want us to write?

I have my science GCSES in May and June and I'm desperate to get A*'s in all three. I got A*'s in my mocks. But I have been revising recently using a lot of past papers from the website and CGP papers and I'm not doing very well. I got 50/60 in one of the B1 CGP papers but the grade boundary for them is 51 and in a recent B1 CGP paper i only got 42 which is equivalent to a B according to their boundaries, it was my worst mark out of all the B1 papers I have done but it was also the most recent after looking over my mistakes in the previous papers. I just can't seem to get secure A*s and now i'm panicking a lot and can barely concentrate on other subjects. please tell me what I'm doing wrong because I look over all my mistakes and reading over them in textbooks and seem to understand them but I'm not improving and I'm running out of time and papers.

But the AQA mark schemes seem to be ridiculously specific about what they want us to write?

I did aqa science GCSEs as well. When I revised it helped me to turn my cgp revision guides into flashcards: whenever they talk about something in bullet points or lists, write it on a card. Make a pack for each exam, so 9 if you're doing separate sciences. Then revise each pack a lot. You'll find you remember things much better. No point in using up papers if you're still lacking the info. Good luck!