Has this child ever been assessed by the school resource area for learning issues? I think this might be a wise step.
As he is lacking language skills you may also find help on our New "Speech and Language Disorder Forum, there may be others there with ideas for you,Get him taking a good muliple Vitamin-mineral supplemnt with B Complex and Vit C, and some parents swear by fish oil, how is he at school , , focus on the positive side of his behavior, and give him plenty of attention,make sure he gets as much as the other children, does he do a sport and outside activities, this could help him.