azzikiel, I'd be very careful about what I say, whether jokingly or not. The seriousness of such an act is something many students do not seem to understand. I personally know the results of such events and was indirectly involved, although not for the CSSA trial. As for some tips, I sat the exam last year and these are the best things I can think of:
1. Know your facts. These constantly turn up in multiple choice. Things such as which denominations formed the Uniting Church, what year it was formed, what Act was formed from Mabo case etc. are all extremely common and reoccuring questions.
2. Ensure you are prepared to answer anything from the syllabus that they can possibly throw at you. This means actually going through each section of the syllabus and ensuring you can give a decent response off the top of your head, if not go back to your notes and try again. Often questions will be taken directly from the syllabus and you can be sure those that arent directly from it will relate to some section, whether or not it appears to.
3. Know what you will talk about in the last question for the 1 unit course or the last 3 questions for the 2 unit. This is a 20 mark essay, and there is a very limited range of questions that they can ask. As to how you would remember such information, I guess thats different for each individual. I found writing an essay and memorising it to be best, but most I know wouldnt go this approach.
Hope that helps and most importantly good luck! Remember these exams are called trials for a reason, so dont be so disheartened if everything doesnt go your way.