The schools would be run by Achievement First, a nonprofit that operates 20 public charter schools in New York and Connecticut. Those schools’ students consistently outperform city and statewide averages.
Politifact, via the ProJo:
Taveras said that Achievement First schools in Connecticut and New York "consistently outperform city and statewide averages." That’s true for math but it’s not true for other subjects. It’s true for city averages but not for statewide averages.
In other words, the mayor overstated the case for the charter school operator. We rule the claim Half True.
It is a pleasant surprise to see Politifact checking school reform claims.