Step 1: Fulfill prerequisites
Step 2: Choose what you like. <---- Golden rule of VCE and life.
It's rare any VCE subject will significantly help you in uni, at least the science ones. VCE bio is rehashed again (now at a faster, less deep pace), physics can be done, psychology can be done. Keep in mind most uni's do not offer "advanced level" psychology or bio. If you did them in VCE, you will have to take the same subject as those who did not do it in VCE. I can't speak for psych but bio was 85% VCE coursework all over again, the rest was quite interesting though. So, basically for those two you do it again.
That said, it is much more helpful to do it before. I know people who didn't do VCE bio and struggled with the content and pace (although now in my 4th year it seems so simple..).
Y'know, unless you go to Monash and have to do PHS1080 because you're not in undergrad med or biomed...
Nah, seriously though, you should probably listen to the guy actually studying med over me, hahah.
Good to know its
still horrible....