From The Atlantic:

Practice Makes Perfect, currently in its fourth year, is designed to reduce the loss of academic skills and knowledge that occurs during the summer months. The founder of the program, Karim Abouelnaga, has created a model where students teach each other, building upon his observations that younger children are more receptive to teachers from their own neighborhoods or backgrounds. Practice Makes Perfect is currently in the process of changing from fully philanthropic to a more sustainable fee-for-service approach, which Abouelnaga hopes will allow the program to expand and reach areas where its services are most needed.