You can only do your Theory Exam once. Once you pass,.. that's it.
Maybe you meant that you have done RA Theory and are doing a GA Theory exam
You will probably not pass a PPL with RA Aus theory, as there was a big push on finding rules and regs out of AIP and Ops etc.
I remember a question on Daylight and Darkness charts for someplace interstate and trying to be as fast as I could in plotting Co-ordinates on the test and then going to the UTC time etc etc. Now its all on your GPS info.
The PPL theory exams are more in depth than RA and the theory exam was a 3hr open book exam when I did mine.
A lot on Weight and Balance in aircraft that I would never fly, but I think the GA exams are presuming you are going through to CPL.
Your flight school should follow up with CASA regards to endorsements not transferred and why.
Your PPL flight test will be maybe a 3hr flight with Engine failures, Instrument failure, and at least 1 diversion and landing I think at 2 outlying strips apart from your departure??
and yes you would think that if you are born and educated in Australia, that we can actually understand and speak a little bit of English. Its a test more on comprehending the requirements and directives and other foreign accented pilots, in a cockpit environment. Interesting, but I thought it was a waste of my time and money personally.
I hope I am sheading a bit of light on this?? Just my experiences really.