The method I am about to describe works for postgrade med, not sure about postgrad dent though.
You can 100% do med at UoM should you get above the cut off score (which is 99 i think?) and are willing to pay a full fee place for postgrad. Dent, idk but all i know is that dentistry has fewer places than med.
Even if you get above 99, you still need to maintain a GPA of at least 75% (not as easy as it may sound) and you need to pass the interview, only then can you get a FFP and pay like 200k+ for your course while the CSP kids pay like a quarter of that I think
This also applies for the Doctor of Dental Surgery I believe
If you get 99.90 or above, then you don't need to worry about your GPA, you just need to pass the interview and take the required subjects and bam you get a CSP place.
List of guarantees and conditions:
http://www.futurestudents.unimelb.edu.au/admissions/entry-requirements/guaranteed-entry/guaranteed_entry_pathways_by_courseBut yeah depending on what major you take, you'll have plenty of options to fall back on
I'm intending to do a major in maths, so if I decide to go for Medicine or dentistry or whatever, but I can't get in, my maths major will just allow me to do a masters in engineering, commerce, IT, teaching etc or I could continue studying maths at a masters level