hey! my first exam is on the 17th too (got a psych paper aaah)
so luckily you still have time, its not too late. for the subject ur still learning the content for, you need to take the reins and start studying fo rit yourself, you can't rely on the teacher or anyone else. its going to keep you ahead of everybody and give you enough time for revision. the way you go about that depends on your subject, but its it a subject with multiple topics and is more qualitative, i suggest instead of making notes, either make mindmaps or flashcards, so when u come back to revise ur using active methods of studying cus youre either testing yourself or connecting points to understand the topic, rather than passively reading.
as for not remembering, your mindset mattes alot so tell yourself you're good at remembering things. this will boost ur overall stressed mood and force ur brain to fullfill that thought process. for methods you havent tried, try the feymen technique ; explain the topic to someone else, teach it - doesnt matter if ur looking at ur notes or class powerpoints, just grab a friend or a classmate and explain it to them. another thing you could do is if ur subjects essay based, start making essay plans and then check with the mark scheme, did you include most of whats asked? another thing is most subjects have a slight edge in technique than content. for example your ao1 is poor but the paper mostly wants a02, so focus on imrpving your ao2. so go through past papers, see which AO's are important and focus on improving those as they carry heavy grades. do past papers! do them in timed situations especially so you know how you would do with time management in the exam + see where ur weak at. also the day before my mocks and exams, i would pull out old past papers and see where i made mistakes and read the tr's feedback and just by myself try to assume why i messed up, with the actual mark scheme next to me.
if a levels dont work out (which im sure they will as i think ur just stressed, but ur grades are solid) u could do an appreticeship if avaliable where ur studying + working and getting paid. another option is foundation year in university for your course
hope this helps!