back in 1970's, most of chinese women stayed at home and produced a lot of babies for the potential world warIII. they taught their chilrden and you are now one of the children. most of their children didn't need to pay any tuition fee or so-called public schools in china. and now these children are the major force of economic development of the world. you didn't need to go to private schools to learn Math but yours are much better than those studied in private schools in US.
as per your definition, they were /are from rich families.
see the contridiction?
在北美,当家庭主妇是上流社会的标志