Don't forget about that Swinburne free lecture too, I never went to the actual lecture but at least sign up for it to get access to the online resources they put up.
You'll have a good sense for what's on the course and not on the course, so you can also go pretty far back with the VCAA exams. I'd recommend at least do the directly previous study design. I think Mark Kelly's post-mortems had the relevant/irrelevant questions listed too.
If you don't want to do the old Information Systems exams (or find that there's only a couple of questions worth doing by that point), I'd at least study the assessor reports for those. You might find a lot of familiar content, there's DFDs, pseudocode and case studies you can analyse from those ones. If you get stuck for what to study, looking at the quality of the answers you write down is something you can nearly always improve upon.
I wouldn't recommend doing non-VCAA exams from previous study designs though.