@gretelhousegHi there
I'd recommend starting to learn the content if you feel you're not ready for papers. Tomorrow and also half of Saturday if yiu still don't have everything, I'd suggest going through your notes/revision book. Try to learn the basics and do this whatever way seems best, if I'm rushed for time I tend to try to memprise key facts as I go, making short notes of small things that will jog my memory or key formulas. Try doing this for the whole content (skimming through as much as you can). From here you can go over the quick notes you made and try to recall key facts and you should find you have a very basic understanding from here.
After this I'd say focus on the paper. If I'm not mistaken, it's organic on 11th? Write down clearly the names, mechanics and examples of key reactions you're expected to know and try to memorise these. I find highlighting key parts works for me then trying to write the reactions out from memory, each one at a time. The synthesis routes for AS and A2 are key so trying to learn as much of this as possible (try writing small sections from memory and build on it each time you memorise a new section, this works for me anyway). Reactions and synthesis tend to be the topics with the highest marked questions. You could browse through some past papers and see which topics are typically worth the most in the paper and focus more on those.
If you're finding a certain fact difficult to understand then I'm sure it'd be worth making use of tailored tutors! You could even ask them what they think the best last minute revision tips are?
Hopefully after a couple of days you'll be ready to at least attempt questions and ideally do papers, so that by Sunday you could skim through the content again but be more knowledgeable about each topics and can therefore afford to try learning the more difficult facts for that higher grade. From there you can do lots more papers and learn from the mark scheme (crucial)
Learning the basics is very important in chemistry so it's worth making sure you're very comfortable with it before expanding to the more difficult content, or else you'll probably struggle getting to grips with that.
After this you'll have time to go over all of the content from the whole course and strengthen your understand for paper 3 by more general revision and memorising and/or doing plenty of more papers!
Remember this is all just a suggestion but I wish you the very best of luck.