I understand that wealthy parents are going to show up in these stats far more often than non-wealthy. I take umbrage at the statement it's
only the wealthy. It has turned into effectively only for the wealthy due to the focus on equity over the past 20+ years as we've torn down any sort of public programs for these students.
My advanced class placement started far earlier than high school. 5th grade is when I recall being put into the advanced track along with others of demonstrated ability. I'd say from my memory maybe 1/3rd of those students could be described as wealthy by any sort of the word. But they'd be more middle class vs. working class in retrospect. They just seemed wealthy in comparison at the time.
The one thing that had near 100% correlation was highly involved parents - even if they were single moms who never had time to be directly involved. All the kids were held accountable at home. I never had outside tutoring, and few of my peers did either. It was all in-school education, where we were removed from normal classes for a few subjects but otherwise part of our grade level for everything else like social studies or gym. Plenty of time spent with said friends at various houses doing homework together though.
I totally agree this needs to happen at a very young age. I was able to test out of the public high school in 10th grade due to being tracked the way I was in grade school and junior high. High school due to no advanced courses being available was an utter waste of time. Those programs that got me there have now been long-removed in the name of equity. This is the one political topic I will speak out on, since it's outright evil what we are doing kids in the name of fairness.
You really couldn't come up with a better plan to cripple a society than what we are doing to public education.