Greatschools has shown me that the schools in my county are rated by percent of black. The higher the percent, the worse the school. In every school in the county, black students get 1s/2s on test scores and whites get 8-10. Asians get 9-10. The white scores are lower in the schools with more black students.

I want to put together an interactive playground of data, but greatschools charges $99/mo for demographic + school data.