For me, making heaps of notes helps. I get alll my study guides, all my class notes and all my text books and have condensed them into summary folders, one fore each topic. From there i condensed more into only one folder for the whole subject. From there i condensed evern more to flash cards which really help.
But thats just me and they say that everyone learns differently. I also find sticking things on the back of the tiolet door and on the wall near the mirror in bathroom (where i stand to brush my teeth) and on the top of my cds so i look and them when i pull them out, all really help me.
The only bad thing about that plan is if you have an annoyig attnetion seeking little yr 8 sister like mine who isnt coping with the fact that my parents are focusing on me durring the HSC. She ripped down all my bio notes in the bathroom and put up her own maths ones that say things like 'alternate angles and equal' and 'angles at a point equal 360'