You mentioned getting an outside speech/lang. eval and I think that's a good idea (Just make sure you find someone who is capable of testing for your concerns). Your medical insurance may pay for this eval (ours always has, except for the co-pay). If it turns up something, you can take that report back to the school, and they have to consider it. You may also want to go back to the neuropsych and ask about standardized testing for poor EF (other than the BRIEF), or possible memory issues, to pin-point exactly what he is struggling with. You know that he's not turning in his assignments, but the school may view this more as a behavior problem than a neurological issue. But really, this is something that I think can go into a 504 anyway...teachers actually helping him to use the organizational aids/supports (so that hopefully one day he does it on his own), but it's just not happening and it's a compliance issue. Why are the teachers not complying? Are the accommodations/modifications unrealistic and too difficult for them? Then it's time for an IEP and sped teachers to get involved, because simple accommodations/modifications do not work and the teachers don't have time to do more complicated ones or take the amount of time needed.