Here are a few options that I kmow of
If you want to study accounting you have a few options available to you at the moment.
1) Some universities offer Early Entry based on a Principal's Recommendation - these positions can be granted to a course based upon the recommendation by your principal that you would be able to handle the workload of a university level course. This may not be so relevant to you in that if you were removed from a class, it's not likely that your principal will vouch for you, as well as the fact that most Early Entry/Principal's Recommendation schemes have closed for 2010.
2) TPC - Tertiary Preparation Certificate (Cert 4) run through TAFE. This course only requires that you have completed NSW School Certificate (Year 10). This is a very good course focused on a TAFE style of learning (skills/competency based) which will give you a TES (Tertiary Entrance Score) which UAC then converts to an ATAR equivalent. When I first did my HSC in 1998 I got a UAI of 69 which was not high enough to get me into any of my preferences. I did the TPC in one year and got the equivalent to a UAI of 85 which got me into Civil Engineering ( I later transfered to Teaching/Design & Technology)
https://www.tafensw.edu.au/courses/about/preparation.htm
3) I don't know about this last option but if you were to somehow complete a TVET course which was a framework course it would count towards your HSC, the question would be whether your TAFE & school would be prepared to allow it.
Good luck, hope it all works out for you!