Just to tell you, it's not just Accounting anymore, it's financial services for a reason, the final exam will only have like 1/8 of the exam as accounting (another 1/8 describing the process of it, but that's abit different,more university level i guess), the rest is theory. Although my TAFE had us learn everything in accounting as they would've taught for Accounting HSC. Anyone who did just Accounting for HSC previously had it easier(I could've easily gotten a state rank for it,it just becomes logical after a year,but some people never get the theory). The accounting you learn will help you basically for just the first-semester of university,as it's pretty much the same.
Strawberry makes some good points,but also some bad assumptions. Doing Financial Services does help getting a cadetship(or UTS scholarship or Co-op),it is a nice conversation starter,and though the big 4 acknowledge it,the mid-tiers especially like it for some reason. I got a cadetship,and even though it's not just based on the subject,I can tell it helped me pull through,because it shows interest early on.
For a little extra time during holidays, you may do MYOB type accounting and then you would be presented with a finished cert 3. This really helps in getting a part-time job as accounts management/data entry etc..alot of acccounting students previously picked up these sorts of jobs,if not cadetships.
That being said I wouldn't do the subject for 'helping in uni' or 'employable', as ultimately if those are your reasons you will just find this subject really dry,and be one of the people who decides to either drop it in the first term, or at the end of the first year.