It's good that the MAP test results opened the teachers eyes to his ability. Now you can go to her about differentiating his work in order to meet growth goals. Here are some resources tied to RIT scores:

http://www.powayusd.com/projects/edtechcentral/MAPS/
http://www.sowashco.k12.mn.us/ro/Pages/studentlinks/map/
http://www.sowashco.k12.mn.us/ro/Pages/studentlinks/map/reading.htm