As said by the second years above, CRAM CRAM CRAM (for uni swotvac anyway). What I did last year was to do a whole day on a unit at a time, and then rotate through units as each day passed. Made small summary books (A5 size) for each subject (was kinda rushed, but had the main content I had to understand in one section and the stuff that I had to rote learn in another section). Then going through tute questions (this will help a lot, as the questions on exams are sometimes similar to the tute questions, although not all the time). Then moving onto exams, learning how to do any questions that come up year after year (although some units you don't get many exams for).
Basically in first semester last year that was around 11 hours a day for 10 days or so straight. It payed off in the end.
This year, I have a whiteboard drawn up with the next 4 weeks, with what unit I'm going to do each day, going to make a list of topics that were covered in each unit. The problems that I'm running into this year are though,
1. Last year I went to pretty much all lectures, knew what we had to learn even if I didn't understand it at that point. This year I missed a lot of lectures during the last couple of weeks while trying to get assessments done. So I really have 3 or 4 weeks of lectures to listen to before I even start....
2. I have slightly less time than last year's swotvac period, and an extra exam.
3. Units are actually hard and more content compared to the first year units last year.
4. Got my last major assessment done today, went to sleep at 6am, got 3 hrs sleep before I had to wake up and hand it in. I'm now down and tired and have my sleeping pattern shifted 8 hours or so.. Need a day or so break just to get back to being able to work.... So that's even less time.
I've probably gone off on a tangent here, but I think the main points are use your time wisely, but don't overdo it that you lose more time. A day or half a day break is good every so often to let the information sink in, and rest up a little. But for eng/sci, definitely go over past tute questions.