Applied Finance
That's your Applied Finance course stream
Commerce-Accounting
And there's your Commerce-Accg stream.
Basically if you can find units there which have no pre-requisites, or units with pre-requisites which you can satisfy, then you're ok. You can also try and apply for a waiver to have some of those pre-requisites 'waived' and allow you to do them.
Generally, in any degree, you can do any unit you want as long as you satisfy those pre-requisites.
So ACST101 and STAT 170, and a COMP/ISYS unit are no issues, but the ECON and ACCG units may be a bit more troublesome.
Alternatively, you can try and do subjects you have an interest in (outside of AppFin/Accg) and try and get a good gpa so you can transfer. These will then be credited as electives when you transfer, so they won't satisfy the core units, but will count towards the credit point requirement in the degree.
Also I find it hard to believe your friend was allowed to do 'any' subject, there surely would've been restrictions placed on professional/prescribed courses like Accounting/Law/Engineering etc.
Hope that makes sense?