Thanks for the help guys

Just to confirm, if I enrol into these classes now, will I still be eligible to receive further offers from UAC? I'd like to secure my spot into the classes so that I can have a good timetable, but I'm also interested to see whether USYD would take me for Com/Law!
EDIT: I just got off the phone from UNSW to ask about my enrolment. The support centre for Business is actually closed until the 2nd of Jan, so I had to call the 'future students' line instead, which doesn't actually specialise in what I needed. Luckily, the person on the phone was actually a Commerce student himself, so he was able to help me out regardless. Anyway, the main thing that put all the pieces together was that I realised that a timetable is only for one semester. I was originally planning for my timetable to cover me for the whole first year, which is why I started off with 8 courses.
Now that that's over, I think I'll start off doing a mixture of my core and flexible courses, so I'll leave the mathematics related courses for my second semester. I'd like to start off with content that I'm familiar with, rather than facing the uni transition AND the anxiety of mathematics.