Yes basically I observe the trend as I watch Olympic cycling. Year after year a few of the cyclists in the middle of the pack minutes behind the leaders took a different route (private schools) late in the event only to emerge in front crossing the finish line. This isn’t scientific and I have no data to compare AP course offerings and scores etc. Those who left have more money and colleges might like full pay students more (and I don’t blame the colleges).
@typiCAmom I wish we had Iowa test in our school so I can have some data to base my assessment on. Our region favors local control and people feel good about their schools (without comparing to other states).