I won't lie - job prospects are pretty grim. Even though the economy is doing well (relatively), unless you are the best of the best, it will be hard to find a job in I-Banking, or even institutional banking (NAB, Westpac, CBA only take around 8 grad in institutional banking a year).
However, if you are determined to get a job in I-Banking, make sure you work your ass off. You're gonna need good grades - at least a 75+ WAM, coupled with good extra curriculars.
Its an unfair comparison to compare finance mathematics with Advanced, MX1 or MX2. Quick run down -
The Financial System - intro to financial system - year 10 math. If you can do algebra, you will be fine. However it is content heavy.
Quantitative Business Analysis (first quants based subject) - Involves differentiation and integration, which is covered by Advanced. MX1 helps you slighty. QBA also involves econometrics, which is stats based quants and nothing like anything you would have studied. Because of this, no comparison can be made.
Investment analysis - if I could give you a HS subject equivalent, it would be Extension 9. I've seen very capable students do very poorly. Its a hard subject.
That being said though, a finance major is still pretty useful, even if you don't want to go into finance.