The purpose of schools is to turn children into good citizens.
Learn to sit still and be quiet, listen, follow orders, fulfill predetermined tasks, learn that life is an endless sequence of events on which you have no influence. Learn to focus your mind on a pleasant future, the hours after school, the weekend, school holidays, like later, when you are in a job you don´t like.
School is to prepare for the life, government and the ruling class want people to live as adults.
Fortunately it doesn´t always work as intended.
My parents for example were taught in school that Germans are the master race and while they certainly enjoyed the social aspects of the Hitler Youth, the comradeship, the torch marches, violin classes etc., they didn´t turn into Nazis and I guess that´s because their parents where no Nazis , and were able to counterbalance the state indoctrination with different views at home.