This seems like an issue that is easily susceptible to Simpsons paradox. What happens if you also split by race or socioeconomic class? Also, I think part of

This seems like an issue that is easily susceptible to Simpsons paradox. What happens if you also split by race or socioeconomic class? Also, I think part of the issue is that it's difficult to measure what makes a successful high school (and there is no good proxy on a short feedback loop). Is it college admissions? Minimizing suicides (that seems important...)? Etc