Indeed, we start learning from the moment we are born, these adults does not take it into consideration probably because they forgot completely their childhood or they were that way from the start as a child.
The system follows one path and the others who are slower or having other issues are thrown away, I could tell you more about my school time but itchio comments or such is not the best place for more details.
Hopefully more people will write their own school time like HusbandoGoddess and me.