Again, don’t just look at end results, if you want to understand the process from the beginning.
And don’t assume all lower SES kids come in with substandard skills. It raises hackles when I say it, but a lot of them leave a lot of the the rich kids in the dust. Also, the notion of adding economic diversity is not just empty good will. The kids who perform well go on to influence a great number of others. Though some are, you don’t have to be a CEO or judge to have this impact.