Let me start by saying I don't work for this place (but I have done in the past).
Try TVSA (AKA BMSA). They are the one company and have a school in Moorabbin and in Bacchus Marsh (both near Melbourne) - very good reputation with employers.
The web site pretty much says it all - don't know the web address but try a search with TVSA - something should turn up.
Most schools in Aus are pretty good with a couple of notable exceptions.
PM me if I can help.