Look, I probably shouldn't say this, but I'm assuming you wanted to be doctors and large majority were Indian/Lankan/Paki/Asian etc?
Massive generalisation, there are more white people in medicine than any other race, as far as I know - so don't pull those culture stuff you talk about

You'd be surprised. I wanted to go to MHS when I was in year 8, and many I know had similar goals at that time. It's actually not that rare tbh.
Sometimes it comes down to parents (which isn't necessarily a bad thing), but the student usually has interest too (well, I did in any case).
I think I've probably talked to you about this before, but it does depend on a lot of factors, that's why of everyone at Melbourne High, pretty much the upper class of the schooling population at a Year 8 level, there are still those who fail to get a good mark and do rather lacklustre in VCE. It has to do with the school, but not everything.
Parents - well that's a questionable discussion - it's generally good, but dependency is a bad thing - some students are very dependent on their parents to do well and in the end, sometimes they're not gonna be around forever.
Student interest is far more important - in the end it's your life, what you want to do with it is your decision, like this goes out to everyone else discussing this minor subtopic, it's very difficult to know what you want at a young age, however, by the time you're in Year 12 and are 17-18, you really should know what you want to do and take responsibility for it, in my opinion.