In this society there is a regular apocalypse event that can cause 80% casualties among the human race. This happens once every 20 years. While this is survivable, it's not survivable if it happens twice in a row.
This can be prevented by a prophesied child arising who can stop the apocalypse. This child will be generated among the 5-18 year olds, and they have no current way of reliably predicting who it will be. If the child dies before they fully awaken, the apocalypse happens, and the next generation likely has a much higher risk of death due to reduced resources.
The death rate for children then is around 17/1000 and they want the death rate to be as low as possible, while still ensuring that children can train so that the prophesied child can effectively handle an apocalypse. How would a society which wanted to minimize deaths in school age children, make schools?
Awakening as the prophesied child cures all diseases, so being paralyzed or disabled is fine.
Tech level is modern earth, magic is mostly non existent.