Public schools abandoned that long ago, in favor of teaching obedience and social and political indoctrination. After looking more closely at the issue with my own kids, I am am inclined to think that most public education is a form of child abuse.
I have lost count of the highly successful people I have met who, for one reason or another, pretty much avoided the whole public school system. They often seem to know far more than those who faithfully attended all 12 years of formal indoctrination. After looking closely, it seems that any actually useful knowledge picked up in those 12 years could be done in one year of devoted reading and study. Maybe even less.
But those 12 years are very effective at promoting passivity, group-think and worse.