You don't think that VCAA would create a dodgy module? Well that's a tad optimistic. You do physics, so I guess you'll have to think about this sooner or later anyways, but now's a good time
Look at the 2011 Unit 3 Physics Examiner's Report. Scroll down to the Detailed Studies section and compare the marks for Further Electronics and for Materials and Structures. You see how much better the state did in Materials/Structures? Well I did Further Electronics, I perfected it, I did practice exams, I knew the course quite well, although I wouldn't say that I did
badly on Further Electronics, I did a little worse than expected, the fact that it was harder took a lot of time away from the other sections of the exam, I had no time to check over my work for instance. I took almost 30 mins on Further Electronics when I expect to take around 15-20 mins.
I regretted it and I chose to do two detailed studies for the end of year exam.
Believe me, there's no such thing as perfection. VCAA are known to create dodgy and hard modules. Although you might have perfected that module, you're still disadvantaged. I'm not saying neglect your module and learn something else. I'm saying put quality into both. The fact that you know you have a safety net should give you confidence, rather than take it away.
I'm not trying to say what you're doing is wrong, so sorry if I sound a little rude, I just wanted to point out what happenned to me to try and help you, because I've been there, done that and yes, I once had your view too