Not to disagree with your larger point, but comparing school performance is basically bogus. The biggest deciding factor in that is how the parents raise the kids. Do the parents raise mild mannered respectful children who are eager to learn, or do they raise little narcissistic brats who want to terrorize other students and in fact the teachers as well? That's what matters the most, not the quality of teachers or the amount of funding the school gets.

Furthermore, while there are bad teachers who hate kids and don't try, few if any start out that way. They become that way after prolonged exposure to bad students, their bad parents, and the school system which binds their hands and tells them to put up with it.