My ds6 is diagnosed ADHD, but not so severe as to require meds. Some of his behavior is explained by boredom. My ds7 is diagnosed mild PDD. Both have decent grades.

I think part of the problem when my kids go to school is that when they are at home, we discuss mutually acceptable solutions for everyone in the family. At school, they are expected to sit down, be quiet, and do exactly what the teacher says, without any input. The difference between the two kinds of discipline can be jarring at times and the children do respond negatively to it.