iOS 12 brought about a number of changes to the iPad, an important one being the moving and renaming of the Restrictions, which used to be easily accessible under Settings/General. In iOS 12 you can still set restrictions on an iPad, but you will now find them under Settings/Screen Time. There are a number of ways in which you could limit your child’s screen time and access to specific apps if you wish to do so. Screen Time especially is a really a nifty feature for parents. It also allows you to switch off features that you do not want your child to use such as FaceTime or Message. Take note that Screen Time is not an app, it is a setting or a selection of settings.
There should be a differentiation between school screen time and free screen time for fun. School screen time is directed and led by the teachers and results in the child moving away from the iPad screen to interact with others, write or apply themselves elsewhere during an activity. It does not comprise endless hours of looking at a screen without activity. School screen time encourages engagement with the screen, written work (possibly), specific apps and peers. It serves a definite purpose. Screen time for fun is the activity that needs to be monitored and this is left to the parents’ discretion.