yeah guys the HSC isn't all what it's cracked up to be
All you need to master is good work ethic (studying, working hard/consistently) and even then it's only if your natural ability doesn't compensate for such
Case in point, one of my mates got into advanced science at Sydney without study and I got into Engineering at UNSW without study.
Work intelligently and treat it as a piece of cake, knowing that even if you don't get the marks or course you want, there is always an alternate route into what you want to do.