kyokaku92 and Aquawhite, thanks for the advice guys
I was thinking the exact same thing as what you two have said but I wasn't too sure if I was correct. Boy, a bit of reassurance can go a long way.
Nutcracker, I understand what you and DCH are saying, but simply put it - I really don't have time for MORE maths. I'm already doing upwards of 1.5 - 2 hours a night on exercises. For 2U maths, we don't get 1 exercise, we get 2 or sometimes even 3. I've got 2 seperate majors which go for the length of the year that require quite a bit of time. And then there are the heavy theory subjects like SOR2 and PDHPE. I'm not saying these 2 are hard, but they require time. English is a lot of analysing, reading and essay length questions (mostly past paper HSC questions which take around 40 mins)
If you add all that up, plus lifestyle factors like dinner, taking the dog for a walk, travel time to school etc, I really don't have much extra time to spend on 2U maths.