Hmm… I can think of one reason. Public school is designed for the bottom 60%. Therefore the top 40% will always be dragged down towards that level. I also foun

Hmm… I can think of one reason. Public school is designed for the bottom 60%. Therefore the top 40% will always be dragged down towards that level. I also found (this may not be true in general) that the majority of public school teachers come from the bottom 60% and they have a serious lack of ambition.