I totally agree with SRL. Get him evaluated away from the school. I like neuropsychs. They tend to hit every area of function. They are non-partison and have nothing to lose or gain when they do the testing. The SD does.
I have two kids who had IEPs and neither one has a low IQ. One is on the autism spectrum under (other health impaired) and my daughter was Learning Disability (LD), but above average IQ. She has been downgraded to a 504. Both are mainstreamed almost 100%. But the early help that they got really helped them. Good luck 
