Those larger gains can be explained by the charter school model of a focused learning community.

It's about establishing a collaborative professional learning community,

We're seeing more money and resources on test preparation. Does that make our kids smarter? No, it doesn't. It makes them better able to take standardized tests.

Basically, we just want them to get in school and get learning,

He was sent, as usual, to a public school, where a little learning was painfully beaten into him, and from thence to the university, where it was carefully taken out of him.

It would be difficult for a large high school to get the same kind of results that small learning communities produce.