Possibly the ACHIEVE program
I do not know if they are active in the summer.
Program manager Shannon Kirk
skirk@somsd.k12.nj.us
This sounds pretty intense and expensive but in case you don't know of it:
Promote your business here - Businesses get highlighted throughout the site and you can add a deal.

Does anyone know where a high school student could go to increase their reading speed and retention and also their writing skills?