High school history should be optional, as should geography and English, music should be entirely optional for the duration of school. There should be more sport (specifically team sport, it's important to learn how to function in a team) for younger students, as well as specific science maths classes for younger students (at the very least separate biology class from physics class for juniors, it's quite common to hate one and love the other, we rarely want to waste our time with both).
Things like food tech (hell, technology subjects in general are greatly under represented in Victorian schools) should probably be given more attention, I was lucky in that the high school I went to had good facilities, however we spent very little time using them, perhaps more opportunities to use them (without forcing it upon us) would be good.
Ultimately, it's important not to force children to do things, everyone has different goals and ambitions. I remember being particularly annoyed that there was a mandatory unit on the renaissance when I was in high school (year 8 if I recall), especially because I was completely uninterested in the arts and ultimately got nothing from it, my time would've been better spent doing specialised mathematics, and given the choice that's what I'd have done.