The public schools I grew up with in the American midwest (all lower middle class) were uniformly good but this was 50 years ago when such schools were widely funded by local sources (e.g., property taxes from the community), did not have to account to the distant bureaucracies or have to focus on prepping kids to meet minimum proficiency tests by which educational results could be measured with mirrors, and did not have to deal with unions whose goals seem to be as much about promoting the interests of their members via ever-expansive forms of public funding as they are about helping kids learn. The public high schools I attended in California in the late 1960s were also good, and it was naturally expected in that day that the vast majority of the kids would not only graduate but would also be literate and reasonably taught once they did so - there too, all funding was purely local.
The key is to have the schools, whether public or private, in the hands of people who care really care about what the kids learn and that means local people who know them and know their families. This element has largely been lost in modern America's public schools, and it is a real tragedy.
It is nice to see the resourcefulness of parents who seek to overcome the resulting mess but this is a struggle that is often just plain desperate in light of the overwhelming problems that now beset the public schools. This piece reminds us that there is always hope where people really care.