Hi to Asteriskk and anyone else interested,
I wrote the year 10 exam in 2012 and I remember there were around 100-120 students who did the year 10 exam and around 70-80 who did the year 11 exam. The individual tests themselves, like memely mentioned, were basically the same as the year 9 tests, but obviously being a bit more advanced. I remember having a month or so for preparation, but all I did was do 4 or 5 practice tests(which i found online) a few days before the actual test.
In terms of what to study, the only thing you can study for is the mathematics test, which basically involves calculation and word problems and stuff like that. As far as I can remember, the hardest thing on the test was like simultaneous equations. surds and a few solving questions.
The verbal reasoning, numerical reasoning and the comprehension mostly involves logic and reasoning (as the title already says). You can't necessarily study for this stuff, but more like prepare for it. The best thing you can do to prepare is do the practice reasoning and comprehension tests online.
And for the writing pieces, I was really lucky I got two topics that I could actually write about and I did surprisingly well on that.
And regarding the interview, I didn't actually have to do one, because I did so well that there was no need for me to do one. But if you do have to do the interview, make sure you emphasize on extra-curricular activities because the "work-life" balance is crucial to nossal.
So yeah, that's essentially it. Make sure you don't panic, that's also important.
Hope this helped. Please feel free to PM me anytime.