That "index" is terrible. It claims to be a ranking of all schools: > Schools ranked no. 220 or above are in the top 1 percent of America’s 22,000 high school

That "index" is terrible. It claims to be a ranking of all schools: > Schools ranked no. 220 or above are in the top 1 percent of America’s 22,000 high schools, no. 440 or above are in the top 2 percent and so on. But he only has ~2,000 schools in his database, or less than 10% of all schools.