Jenny Pilkington, thank your for using the app down under. I almost went to UNSW / AGSM myself. These questions are meant for preparation and not to simulate the actual test. Your best bet would be to get the Official Guide to GMAT by the GMAC (administrator of the GMAT). They have old tests and the scoring guide accompaniment. Then you will know where you are weak and what topics to focus on in the prep course. Good luck!