I feel like its necessary to make yourself really unhappy and push yourself to the point of mental collapse in order to revise well and not procrastinate, I mean thats what I've always done in the past and it worked (10 A*s at GCSE, 3 As at As - note that A*s don't exist at AS). And by mental collapse I mean revising 8-9 hours a day and having no social life whatsoever. Ultimately I think you've just gotta tell yourself: "look kiddo, another month and a bit of absolute misery and then you have so much time to waste."
I mean its a foolproof technique, if you can get yourself to do it. Saying that I can't get myself to do that this year. Which sucks. So I'm in the same boat as the person who made this thread to begin with.