I wonder why your school would recommend testing and then not have a plan to do anything with it? Did they assume that he was going to score on the low side?
Are the problems mentioned only being seen at school or at home also?
I would check with your state's gifted laws and then approach the school for an Educational Plan meeting.
Many problems can be worked out my having a meeting that includes the pricipal, the teacher, and your psych. if you find one.
In the meantime I would follow up with the school psych. who did the test and ask her some directed questions. She should have made notes in the full report outlining his behavior patterns during the test. You may get some answers from her.
GOOD LUCK!