THIS. ^^^^^^^^^^
This is what I'm trying to figure out as well, the op is asking fornhelp and I'm trying to tell her what she needs to do. Seriously, screw what to school is saying to you and find your own audiologist! I don't want to sound mean but if you are asking us what to do, I'm telling you you need to stop listening to the people who obviously don't know what they are talking about aside from telling you your son failed a hearing test. Go to an audiologist, where YOU sit with him while he has his tests, and where the Audi can tell you what it all means. And at that point if something comes up on his tests that the Audi doesn't like you will be referred to a specialist. The op already said she's taken him to this same hospital, and had numerous hearing tests he's failed.
Google your town name and audiologist, call... Make an appointment for a hearing test..