In actuality education system serves four purposes:
One: make both parents avaliable for the job market. For that it must supervise children during work hours, to make sure they aren't getting in trouble, drugs, or worst of all, into politics and protest
Two - They must habituate little wild chimps into highly unnatural behaviour. Wake up early, commute into arbitrary location, sit in one place for hours on end, stare into paper, whiteboard or screen, perform meaningless tasts tasks that have no meaning to your life. Thats your whole life.
If you don't ease people into this gradually, you run out of psycaotrists.
Three - grade people into quality batches, based off their punctuality and ability to perform meaningless tasks to arbitrary and meaningless quality standards
Four - because the management has gone trhough the same system of educations, the pupils must learn to read through poorly worded vague instructions and understand what their superior actually wants to see, even though they are not capable of expressing it clearly. Poorly worded exam papers serve as good training.