When I was in Australia and applying to study medicine (late 90s):

Course acceptance is initially driven by academic performance, and ranked scoring.

To get into Medicine at Monash and Melbourne Universities, you'd need a TER (Tertiary Entrance Ranking) of 99.8 (i.e. top 0.2% of students). This number was derived by course demand and capacity.

But, during my time, Monash was known for having a supplementary interview process with panel and individual interviews - the interview group was composed of faculty, practicing physicians not affiliated with the university, psychologists, and lay community members - specifically with the goal of looking for those well-rounded individuals.

It should also be noted that though "undergrad", there's little difference in the roadmap. Indeed when I was applying, the MBBS degree (Bachelor of Medicine and Surgery) was a six-year undergrad (soon revised to five), with similar post grad residency and other requirements for licensure and unrestricted practice.