My DS12 has inattentive ADD. He is not hyper at all, he is just flighty. He is easily distracted and requires a lot of redirecting to stay focused. His teacher mentioned in 3rd grade that it might be good to look at testing him for ADD. We started to pursue it through the school district BUT the guidance counselor gave me so much wrong information that we gave up on that. Our pediatrician has a diagnostician on staff so we had her test him. Our insurance covered it because it was billed through the pediatrician. She said he is a textbook case of moderate inattentive ADD. Some insurance will cover it through a psychologist, but it is covered on the "mental health" side, not the medical side. The testing is expensive, but it is worth it.
We also had the problem of the school year ending before we could get things sorted out, so DS wasn't diagnosed until the second semester of 4th grade, and we didn't find a medication that worked until the first semester of 5th grade. He will finish 6th grade next week.
Middle school has been a tough transition for him because he has to deal with 6 different teachers. He has a planner. The first planner got lost within a week. The second planner he has managed to hang on to, but he likes to draw little pictures of rocket ships and Godzilla in it instead of writing down his assignments.

The teachers maintain an online grade book so I can monitor what he is doing. There have been times where he was missing like 4 things in Science. He claimed to have no knowledge of any of them. I pulled out his binder and came up with 3 of them. He just can't seem to manage all of his subjects all of the time. Something is always falling through the cracks, and that's WITH medication. He is a solid A/B student and is in the honor society. He aces his standardized tests every year. He is smart, but he is disorganized.
Good luck getting things sorted out with your DD!