The most helpful environment is a school able to understand these kids, and use the right ways to teach. Using the wrong ways, the outcome will be serious.
For example, if your eyes cannot see pictures, but the teachers blame the child for his "blindness" and forced him to read the words from the pictures that he cannot see, as part of the exam assessment, what do you think then?
If the school understand that, teachers will not force kid to read words from pictures, but will help them using other ways to learn and to asess during examinations.
Change a school that can facilitate him rather than destroy him in the existing school if the school does not provide support, or even causing damage to the child