You know, that could be part of it, but it could also be that there are so many advances in how to diagnose ADD/ADHD and what it even is. I just found out recently that I have ADHD and I was shocked. I told the p-doc that I always did fairly well in school with the exception of a few classes in college when I was having my first depression. I do, however have much trouble in math. I think I had an undiagnosed learning disability in math. I understood concepts, but just couldn't get the numbers to work.

Also, there are schools where you don't have to teach to the test. My son goes to a private school on scholarship and they have their own teaching philosophy geared toward teaching children to think and analyze. (my son is being evaluated for ADD/ADHD and learning disabilities.)