I am concerned that you are not seeing the entire picture. I don't know if you have children in the public school system, but I do. My children attend William Fox Elementary. And although Fox is a model that the system should copy, there are problems that the schools cannot handle. Many don't get enough to eat, their parents don't or can't read to them , Most do not get homework help.
Many children come from broken homes and have little or no stability in their lives.
I know of one child who sleeps at school because she gets no sleep in the homeless shelter she lives in. Teachers are dealing with all these problems with little or no back up. They are told to raise the test scores. It's difficult if not impossible to raise the test score of a child who is not prepared and has no backup at home to become prepared. Many of these children are not only ill prepared they are discipline problems in the classroom.