This is my biggest study tip EVER:
http://mytomatoes.com/
It's Pomodoro technique, during which you work for 25 minutes solid and then take 5 minutes break. Using this technique got me though VCE, A Bachelor's with Honours and a Master's. And, I'm about to start my Ph.D and am planning on using it again!
Here are my other tips:
1. Listen to your natural rhythm. Sometimes your body might work the best between 11pm and 3am, or between 4am and 10am.
2. Don't push yourself as hard as you can for a long as you can, because you will burn out. Some people can hack 10 hour days of study, some people can't.
3. Don't just aim for the 'lowest possible'. Yes, it is possible to move between universities and between courses, but it's much easier if you just go into the course you want to finish (if you know what that is, which, at this stage, you should not feel terrible about if you don't). If you know you want to go to uni, but don't know what you want to do, start a Bachelor of Arts and take a wide range of subjects - it will give you the most scope to move around. Plus: you never know what other people are going to do. The 'clearly in' enter scores from the previous year are not necessarily indicative of what they will be in the current year. You never know who else is going to apply...
4. Take regular breaks. Stay healthy. Go for walks (even if it's just around the room!). If you're a regular reader, make sure you keep reading NON-SCHOOL books!
5. If you start feeling guilty when not studying, make weekly or daily plans and INCLUDE rest time. Make sure you take it.
6. If you're tired, go to bed. The worst thing you can do is overload on caffeine because you'll get your whole rhythm out of whack.
7. Prioritise! And, if you need to - make lists!
Your body knows how it wants to work and what it needs. Listen to it.
Good luck all who are gearing up for exams!