Well that stinks. The line "currently functioning within expected levels as documented in classroom performance" misses the point. Can you use evidence that your son takes a long time to do homework, is disorganized or something like that to argue that his disability has a significant impact on his academic progress?

Would your school accept a third party psych eval? I think most have to.

Sorry that this happened. Sometimes I wonder why I bother at all with the education system.