lol you're screwed. I recommend doing past papers at this stage with like almost a day left, I don't need to remind you about the pressure of half yearlies I'm sure you've got that.
That aside, past papers are probably the better option at this stage, get some experience on answering questions that may be similar to the ones you are facing, rather than looking through your notes, which in theory gives you a foundation, but doesn't give you that thinking edge, required in an exam. I'm not saying, don't look at your notes at all, but perhaps prioritise on doing exam papers, and when theres time look at the notes.
TL;dr
procrastination strikes another