out of curiosity, was your difficult child tested by the school to see how his disabilities effect his education?
if so, you should have some of the testing results already--many neuropsychologist's use them as a part of their evaluation. you should have a report that explains what tests he was given, what the scores and their subscores are and an explanation of the results. if he hasn't been tested by the school, its within your rights to request he be tested. its also within your rights to request an independent evaluation if you disagree with their findings.
take a good hard look at those tests, particularly note if there are wide spreads in scores, or subtest scores that seem off (meaning, if it shows he scores 10 across most of them and has one that shows say, a 4....it would be notable).
its better than nothing, and will give you some starting point to at least ask questions regarding your son's educational needs and come up with useful stratgies to support him. from some of what you've said, i'd guess that ADHD/ODD isnt standing alone either, and that even if he aced the testing he's still need support as a 2E ("twice exceptional"-gifted/adhd) student.
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as for the therapist thing...i know where you are coming from. i myself can take it or leave it--i've seen grown adults accomplish nothing but draining their checkbooks (my bff has been with a therapist for 15! years, and she's literally the exact same as she was before she started)--but the flip side is that lots of people do get something out of it. i also think its flat out wrong for another dr to make his care dependant on another course of treatment, making it a mandatory thing. but thats me.
i too was seriously ready to call it a day, even though the therapist was SO credentialed/SO reccommended/SO the expert in the field. i could see zero point to it, and i saw nothing worthwhile happening with my difficult child...and we gave it a year (so no one could say "it takes time", LOL)
turns out, apparently it wasnt the right fit for my difficult child.
found a new therapist and have accomplished more in three sessions than we did in a year. *MOST IMPORTANTLY* my difficult child TALKS to her, and told me flat out she likes her, likes to talk to her, likes going, etc....you could have knocked me over with a feather :-D. for my difficult child, talking to anyone is 9/10ths of the battle, so thats a small miracle in itself.
now whether we are on a honeymoon high right now or if it will continue, I don't know, but i'm eternally grateful i tried someone else before forgetting the whole thing.
i know its hard when you live in a small town, but it might be worth exploring a new person (if you cant get the current one to listen) before giving up entirely.