Do practice for the test. I remember there was I think one or two tricky questions that I would have not known if I didn't practise before hand. But don't worry about spending too much time practicing, it's very easy. Good luck.
No real need to practice at all its so easy, but if you go to google and type in Hazard Prevention Test South Australia, there a couple practice ones which are exactly what come up in the test. Takes like 5 mins max to do them as there are only 5