Your sons scores are very similiar to my dd. The first tester we saw when she was 6, said that the low psi automatically meant ADHD. However, we didn't believe that nor any of her teachers.she is very focused and meticulous. When we had her retested, she still had a low psi. This tester believes it has more to do with her personality and perfectionism. It does not seem to affect her achievement and she gets no special accomadations for it. Although, if she needs it the school will give it to her. I spent months worrying about it and whether or not it was a ld but we are ok with it for now. Plus is it really an ld if it doesn't affect achievment?
