I'm the worlds worst for revising , however the PPL Perfector CD did it for me and helped me pass . I also read the usual ppl books but in small chunks so that I didn't overload at once , otherwise it's confusing !!
I learn things quicker the old fashioned way - taught using powerpoint or blackboard , and seeing technical things up close and explained to me how they work.
Worst thing for me is trying to learn but having too many things going on in your life (particularly work/domestic) at the same time , it makes concentration difficult , and then trying to do the exam is a time waster ................ Do the exam when it feels right
