So perplexed, are you still at the point of teasing out whether medication or other treatment for ADHD is warranted? Are you considering extra time, use of a laptop or other accommodations? Or, are you thinking that some sort of remedial instruction is needed for the writing and other areas that are relative weaknesses?
I don't see him as a student requiring remedial help - even with the discrepancy, I think you'd be hard pressed to get a district to agree that he has a LD that needs treatment under an IEP plan. Unfortunately, the special ed laws don't provide that a student reach potential, only that they make appropriate progress. Typically, appropriate progress is a low floor.
But, if the writing and ADHD are interfering from him accessing the curriculum (and this would be determined via the evaluation, a look at his classroom performance and other data points) - even honors and AP courses, a 504 would be warranted to give him the accommodations he needs to succeed.
Also - keep in mind that ADHD is a medical diagnosis. If the evaluator is not a MD, she will most likely make a referral of some kind to a medical doctor. Often a Developmental pediatrician, neurologist or psychiatrist.
