What's wrong with his attitude? He has studied hard and done lots of practice exams. He is simultaneously confident and a little worried. Sounds like me, right before every ATPL exam and every job interview. Please don't flame me too!
I'd like to help you Baron, but I never did the Aust IREX. I'm quite sure though, having done the ATPLs , that CASA have gone out of their way to make the simple, complicated. I might recommend some practice exams by another author, if you've any doubts about it. A wide variety of practice exams is likely to pick up anything you've missed in your formal study.
Cheers, O8