You probably need either a pediatric neuropsychologist (a PhD who specializes in testing such as IQ testing, etc) or as they suggested, a pediatric neuropsychiatrist or pediatric behavioral specialist (an MD who evals/treats these disorders, sometimes using medicines if appropriate). Any of these specialists should be able to help, although I would ask the scheduling personnel specifically when you make the appointment.

If you're in the Boston area, maybe this would help

http://www.childrenshospital.org/clinicalservices/Site1893/mainpageS1893P0.html

From my experience with friends who went through this, you will probably need to seek out this consult on your own. The school may not help you with the referral, but the school should recognize the results if you seek out a reputable professional. You may want to check with your health insurance provider to see if any of this would be covered by insurance.