How to cope with stressWatch
And to thinking you shouldn't be in sixth form, I think that since you care so that it is worrying you this much you must be a really dedicated student. Lots of students feel like this, trust me, and you can cope with all this exam stress no matter how hard it seems.
Good luck in your mocks btw
I find past papers really helpful and most importantly, be positive
I make sure I have case study cards for each case study, and that all my notes are clear and neat. Mind maps with the main topic in the middle and then seeing how much you can write about it is a good way of seeing things you may not know or need to work on.
For maths, you can get loads of questions from past papers or mymaths. I also use flashcards with formulae on.
Do revision in 30-50min chunks with 10-20min breaks. Otherwise you'll overload! And when you do revise, make sure its focused, no distractions whatsoever! I'd advise not relying on CGP for geography at least, as although there good for covering all bases, they don't have everything in them and certainly,not at the depth you need to know it in, whereas at GCSE you wouldn't need to go in much more depth at all than those guides.