Starfish, essentially these are your options for med:
1) Monash MBBS -> 5 year undergraduate course (ie. right after yr12), requires UMAT+ATAR+interview, no full-fee places for domestic students. Hence, every place is done though UMAT+ATAR+interview, highly competitive
2) UoM MD -> graduate-entry course (you MUST have finished an undergrad degree to apply), some places are full-fee
(i) You get 99.90-99.95 ATAR, all you have to do is pass an interview and you will be guaranteed a CSP ("normal") spot once you finish you undergrad degree at UoM (eg. Biomed).
(ii) You get 99.00-99.85, you have a guaranteed FULL-FEE spot once you finish you undergrad degree at UoM (eg. Biomed). As the the name suggests, it costs a bucket-load, but it is guaranteed.
(iii) You get any other ATAR or get 99.00-99.85 but do NOT want the full-fee place (understandable), you sit the GAMSAT (essentially the bigger brother of the UMAT). You place in the MD will be based on GPA(grade-point-average: your scores in uni)+GAMSAT+Interview, this is for selection for a CSP place.
3) Interstate medicine -> Undergrad courses, mostly 6 years in length. Depends on uni for other info.