When was he given this diagnosis? How old is he now?
It is possible that his scores were misinterpreted - so my suggestion is to have him retested now by a new doctor.
If my doctor won't have this done is there anywhere I can go to have this done privately and how much can this cost
Any Psychologist who administers testing can do this - they set their own rates, so I don't know how much it would cost.
But look for either a Psychologist who does testing or a Neuropsychologist (who is a psychologist who does testing).
when I go back to my GP what can I say to convince him in order us t for us to get t a re-assessment of our son.
I would just tell him what you've told me. Explain to him that your son wants to do this and if there was a midiagnosis, he may be able to get in.
YES! Please do, let me know and let me know if there is anything else I can do!
Have a good day!