Children are unpredictable. They may run into the road without looking, cross between parked cars, or chase a ball into traffic. The examiner pays close attention to how you behave near schools, playgrounds, parks, and anywhere children are likely to be present.
School warning signs are triangular with a red border and show two children. When you see one, you should immediately reduce your speed and increase your observation. Even if the road seems clear, a child could step out at any moment. Drive at a speed where you can stop safely if someone runs into the road.
School keep clear zigzag markings are there to protect children crossing the road. You must not stop or park on these markings during the hours shown on the signs. The markings give children a clear view of traffic and give drivers a clear view of children. Blocking them creates a blind spot and endangers lives.
Crossing patrol officers (lollipop people) have legal authority to stop traffic. When they step into the road with their sign raised, you must stop and remain stopped until they return to the pavement. Failing to stop for a school crossing patrol is a serious offence and a certain fail on your driving test.
The 20 mph limit near schools is there for a reason. A child hit at 30 mph has a significant risk of death. At 20 mph, the risk is greatly reduced. The examiner expects you to observe school zone speed limits without being reminded. If there is no posted limit, use your judgement and reduce your speed appropriately.