I did that whole thing when I was a freshmen, went through the eval and psychologist said I had ADHD. I chose not to get perscribed meds and such, because it's something I felt I could muscle my way through. High school didn't go so well for me, but when I started college my first year I got a 3.2, and I managed to also get a scholarship for my flight training. Not bad for a kid with "ADHD" who never treated it.

I wont get into how I really feel about ADHD here, but I'd say you're best off trying to get through school without medication.