You seem to have misunderstood my comment. I meant that kid with the highest ATARs don't generally do the best at medical school i.e the top 20% ranked students at the end of med school are generally not the kids that entered need school with the top 29% if ATARs. I didn't say they would fail - its pretty damn hard to fail at med school unless you develop a physical or mental health disorder or have some traffic life event occur.Just going to dispel this myth as someone who actually studies medicine - this is not true. Most people get through. The faculty supports students very well and there is lots of support from other students. The people who fail medicine (ie only around 5%) are typically those who never wanted to study medicine in the first place - and in some unis nobody fails because they let students re-sit exams if they fail. Also, grades in med school (at least in NSW) are about as meaningful as what uni you went to (ie meaningless)- everyone receives the same qualification and same internship job at the end of it.
As with everything difficult in life there are levels to medicine and those Drs that make it into the most competitive specialties ( which generally means surgical or other interventional specialties) are often not those that for the best atars