Just wanted to note that my daughter (w/ obvious ADHD) did the conners computerized test as well and scored in the average range. I think it misses some kids. In my daughter's case I think it was because it's a controlled setting with no distractions in the room which you would get in a chaotic, noisy classroom. Probably same with my son. A lot probably depends on the effort/motivation of the child at that particular time and trying to get a good score, kind of like a computer game.
Back in third grade I worked with her a lot trying to make her fluent w/ math facts and she would always improve in terms of speed, but then regress again days or weeks later. The neuropsych said she should have accommodations for math, like a cheat sheet for the math facts, calculator when appropriate, reduced amount of problems, etc.
