It sounds as if we went to similar type schools. My school was excellent back in the day. I had honors and accelerated classes in my public school. When I went to a good private university, I was bored my freshman year. Everything had been covered better at the public high school.
The demographics of the school has changed drastically over the years, but it's still fairly decent, but a shadow of what it had been. Some of the administrators of my old school founded the University of Missouri--St Louis, which started next to the campus of my old junior high.
I was proud of my old school, which was in a mixed neighborhood----doctors' kids as well as middle class with some lower middle class thrown into the mix. The country club kids weren't too obnoxious, well, maybe a little.
In college I held my own with the private school kids. I have this old-fashioned idea that the drive and will of the student, with support from the parents, determines success, not necessarily a fancy school, although the more elite school might help when out in the world for the snob factor. Some large companies promote not on merit, but on the pedigree.