While you may not need a school that focus on his LD (Forman comes to mind), you’ll definitely want to find a school that has a solid learning center where they will follow up on his accommodations. Is he interested in any all-boys schools? If so, you may want to take a look at Trinity Pawling (on the NY and CT border about 1.5 hours from NYC and on the train line). Another option might be Canterbury - they have a great learning center. Maybe Dublin and Wesstown, too, as I understand they have good academic support, too. Good luck!