I can't do it justice here. Click over and hover over the graphs. They're all interactive.
Here's educational attainment mapped against parents' SES. Cullman City, highlighted, is achieving outcomes that would be about what would be expected among schools where the family income is $103,000, not Cullman's $43,000. Why are they able to achieve those outcomes? Americans can start asking those questions and figuring out what lessons Cullman City can teach other schools, because they have that data.
They've other graphs showing the differences across races within the same school, again mapped onto parents' SES. Unfortunately, those charts only compare White, Hispanic and Black students; it would be very interesting to add Asian students in as well.
Being able to identify well-performing and poorly performing schools, with proper adjusting for the kids' background characteristics, seems rather important in identifying well-performing and poorly performing schools.