I have a very specific process in this area.
1. Make a timetable
2. On supposed first day of revising, make adjustments to timetable
3. On supposed second day of revising, print out copies of all exam past papers, convincing myself the ones I have already are too dirty
3. Get bored of the idea the next day
4. Make half arsed attempts over the next week
5. Use the panic and disappointment I generated over the last 7 days to revise properly for one day
6. Once this pseudo-motivation runs out I don't really do anything
7. Await the REAL panic just before the exam and cram
8. Walk out a few days later with mostly Bs and Cs with maybe a D thrown in there.