Conveniently, I received a 93. My advice:
-When it comes to exam prep, do the VCAA past exams. There is no better revision than those; I did every single past exam that was for the current study design for further, and don't regret a single one. I didn't even touch practise exams from other companies unless I absolutely had to.
-In terms of what subjects to focus on, that depends on what you find you do best in. It's smart to play to your strengths (there's a reason I nearly gave up on literature

). Of course, I'm not saying you SHOULD give up on the subjects you aren't as good in (it would be a silly idea to not have anything to fall back on in case), just prioritise those which you feel you can achieve a higher score in.
-Skim over ALL your notes for a subject every few weeks, so you don't have to relearn everything at the end of the year. At the end of Unit 3, I typed a summary of all my notes for the more content heavy subjects, then in Unit 4, before each SAC I made a summary. By the end of the year, I had a neat set of notes that saved my atar. It's something to consider.
-Don't study 24/7. It varies from person to person, but tried not to study past 8pm in Unit 3. I increased my hours in Unit 4, and I'm glad that I eased myself into it because I didn't burn out before exam time.
-Lectures are worth the time, but you don't always have to go to the most expensive ones. My end of year revision lectures were $5 and run by Melbourne Uni students; I received a higher atar than my friend, who attended Engage and TSFX lectures. It's what you do AFTER the lectures that matters most.
-As for what marks you need, check out the grade distributions for your subjects.
http://www.vcaa.vic.edu.au/Pages/vce/statistics/2013/statssect3.aspx Don't obsess over them (remember, your SAC scores are going to be moderated by the exam anyway), but it's a nifty guide to figuring out what marks you should aim for. As a general rule, A+ in every GA means a 40+ raw study score (I managed a 40 in legal with Unit 4 being just an A, too).
Best of luck! Feel free to PM me with any questions
