I don't see how they're dodgy.
What if you had an accident at exam time, can't sit the exam nor would you be able to sit it a couple of months later due to still being out of action? And then all the other possibilities for other people where things could go wrong? How would VCAA be able to organise that? It'd be a nightmare on their part. Not to mention that it'd delay calculating of ATARs etc.
What would stop you from pulling a sickie? I dunno, maybe the fact that derived scores aren't **that** easy to get approved.
Well I think it has to be within reason, exams can't be simulated because the truth is anything can happen in an exam room. They test more than your mere knowledge of the subject, they test things such as how well you hold up under pressure, how accurate and meticulous you are as well as how hard you've been working just before the exam.
Would it be fair if I didn't work that hard throughout the year, but crammed hard for Exams, was doing well on practice exams and I had to get a DES, which wouldn't reflect the hard work I put in at the end? You know what I'm trying to get at here though aren't you?
I'm not saying that people will take advantage of the system and pull sickies, I'm just unsure of how well a DES correlates with an actual score. Maybe VCAA should do a study into this - give everyone (i.e. people sitting an exam) a fake DES from the data they have as they would with everyone else and see how they compare to the real exam results.
wah i just want to know if i can get a 40 with a derived score
That's like asking will you get a 40 with a non-derived score, we don't know, it depends on how it all comes together, your SAC marks and your Exam mark - from the info. you have provided, it is possible for you to get 40+. You should be aiming all A+'s for a 40+ SS.