I used to trade on 50:1, is that what you trade on? How can you trade over the phone, isn't that a pain? What do you base your entry/exit points on (no need to tell me your trading plan)?
Most commerce students aren't very good at maths, since finance doesnt teach you how to solve problems empirically. Just pick up a good financial maths textbook, go to your library and have a look. I'd probably do some reading on statistics first. First/2nd year should be ok.
They are considering cutting tutorials in first year. So dont fail anything. Also none of my courses have marked assignments anymore. Due to the financial strain Templar mentioned.
Med sci requires a credit average also :)
Concessional passes are not offered in science anymore.
If you do fail, try to get special permission. Just be nice to your lecturer, and hope you got a mark close to 50.
Forex trading. I used to trade every day, but then moved onto futures/cfds. You can get up to 100:1 leverage. Go in with $1000 and take a $1mill position and profit off small movements. This is if you are talking short term.