Earlier this evening, NBC News ran a story on the Horizon Summer Programs that are helping public school students address the "summer brain drain". According to the video, the programs help address the achievement gap issues by providing selected students with tuition to attend, individual attention, and a varied curriculum involving swimming and other electives.
In order to attend, public school teachers nominate kids to be considered, and the ones who get accepted have their tuition paid by a private foundation.
It would seem that money, individual attention aka. lower class size, quality time with kids (including schedule) and a well rounded curriculum make a difference in the achievement gap.
These are the same issues public school teachers have been advocating for their schools. Maybe now the "so-called experts" will address those needs for all of our public schools.