If you've done the revision, you've prepared at least a little and that's great. Just give the exams your best shot and no one can ask any more of you. I realize that because this is your second shot that it might feel like everything rests on it, but it genuinely does not. If you fail there are still reasons to continue living, you can redo exams, you can't redo your life. That said, hopefully your revision will be enough and you'll do well.
About 60% bad, 40% good. Right in the home stretch for A Level exams.
Aww At least the end of A levels are in sight, then you can look forward to relocating to Scotland for Uni Judging by the awesomeness that you radiate on here, you'll find people just as awesome as you are there no doubt about it