Go buy some practise exams, you need to get use to how CASA word their questions and what answers they are looking for... this is even more so as you move into IREX & ATPL. They may be expensive at $40 but its better then having to pay to resit the exam again... they really helped me!
Good Luck, at the end of the day the most important thing to your passengers and company will be that you know your stuff and you can make pratical decisions under pressure.
Cheers
stormy