This is the charter school that NYC's mayor wants shut down

"New York's largest charter network outperformed traditional public schools in wealthy zip codes" (Reason.com):

Success Academy schools did well in English—68 percent of students were proficient, compared with 30 percent in the city over all—but in math, the scores were astonishing. Ninety-three percent of Success Academy test-takers were proficient in math, compared with 35 percent citywide.

To put that into perspective, of the 1,282 public schools tested, just 12[*] were part of the Success Academy network, or 1 percent of the total. Yet 5 out of the 10 schools that scored highest in math were part of the Success Academy network. Of the 20 schools that did best in math, 9 were part of the Success Academy network. All twelve schools in the network were ranked in the top 40 for math. Results of this sort were unheard of before Success Academy arrived on the scene.

And they say that conservatives are the "mean ones"? (paulg on Twitter)