Statistics in VCE are so fickle lol. I mean, without knowing anything about anyone, it's statistically likely for anyone to score over the average, if we want to get really technical. The higher you move up, the more ridiculous it is, until there's essentially 0% for anyone ever to get a 99 ATAR.
Now we start to add in facts that alter the statistics (because, keep in mind, we don't know anything about anyone).
Let's say someone went to a top five school in Victoria. Let's say they did Kumon since they were nine. Let's say they studied VCE independently when they were twelve. Now... how likely is it that they'll get above 90, assuming nothing terrible happens and they continue on their diligent path? It's almost a certainty, now.
So, sure, it's "unlikely" when we know nothing about anything that you can get 97 with 5 subjects. It's unlikely you could get 97 with 7 subjects. It's unlikely you could get 97 at all, simply because of what 97 means. But what happens we begin to introduce relevant facts? What happens when we consider that the pool of people who score 97 will be almost exclusively drawn from people who were aiming for 95+? How big is that population? It's small.
In reality, it's not all unlikely. It's not like getting 99.95 without Spec or a language, which is objectively almost impossible. Getting a 97 with five subjects isn't a matter of getting 50s for all subjects, which is objectively ridiculously unlikely. It's more a matter of like... 35 in English, 45 in Methods, 38 in Spec, 43 in Chem, 43 in Physics.
English: 35
Methods: 45
Spec: 38
Chem: 43
Physics: 43
Now, these are OBSCENELY high scores, bar English, but let's face it, it's not completely ridiculous for these scores to happen. They actually happen sort of frequently. So, of course it's been done before. It's done every year lol. Being statistically impossible, or even statistically highly unlikely is sort of wrong. For all we know it's almost a certainty (if we start to build relevant facts into the scenario). Stop worrying about it and just do your work. Good things will happen.