These are the trial exams which are very useful in taking the pressure off. I encourage you to develop some sibling rivalry between children as this will encourage them to strive for 100% success rate. The Boat Quiz  has a lot of the same questions you will be seeing in the exam and will get candidates used to the style of questions Transport NSW like to ask. I suggest you give this a go until you can consistently  obtain 100% accuracy consistently as the questions do change after each attempt. If you are wishing to also obtain you jet ski Licence the PWC Quiz will help you out too.