There's some really good websites that I used for special relativity last year.
http://www.phys.unsw.edu.au/einsteinlight/http://www.rafimoor.com/english/SRE.htmThe other resources I used: Feynman Lectures on Physics and just lecture notes from MIT OpenCourseWare etc. These do go a bit off the VCE course, so probably not worth reading those right before your SAC (as you might come across a few interesting sentences and confuse yourself)
I don't have my cheatsheet from last year anymore, but the stuff that's worth putting on it (this might be a bit more exam oriented, but should be fine for your sac). I ended up dedicating a single A4 page just to special relativity stuff on my cheat sheet.
Quick summaries (2 sentences each) of the history/development e.g.
Galileo:
Maxwell:
Michelson-Morley:
Einstein: (be sure to have the postulates written out in full)
A few definitions
Formulas, Formulas, Formulas (particularly derived ones etc. the ones that aren't on the formula sheet)
A table of values for the Lorentz Factor (to provide for a quick reference/double check answers)
A list of proper values and what happens to their relativistic values (e.g. mass will get heavier etc.)
Basically, you want to put on the kind of things that will help speed up the way you do questions, and provide a solid reference for pretty much any of those more 'qualitative' kind of questions (the ones where you shouldn't need to do any calculations).