Personally, I believe high ENTERs usually indicate who studied most and who chose the subjects that scale high (some people don't really need to study much for maths (methods and specialist), yet it scales high, which helps get high ENTERs)
I disagree. You can't just put high enters down to two factors. Everyone does there own thing and gets there own enter.
My sisters friend from school tried so hard in VCE and was always studying, but no matter how hard she tried in Specialist maths, the concepts didn't click and she didn't get her desired score in the end.
On the othre hand, if I recall caramel correctly, I think she said she barely worked for physics and chemistry, except for the occasional half an hour before a SAC, I think she got perfect scores in both those subjects, despite not needing to study as hard as others would in those subjects.
Not everyone attributes there high enters to the factors you've stated. And not all of those who may not get the highest enter, didn't get it because they chose high scaling subjects, or because they didn't study hard enough. Everybody is different.