The list of symptoms for kids who have ADHD reads like a recipe for problems in school...Increasing academic demands have only made it harder for kids with ADHD, argues Dr. Jeffrey Brosco, professor of clinical pediatrics at the University of Miami Miller School of Medicine. With kids spending more time preparing for standardized tests and less time playing at recess, Brosco says the rate of ADHD in children has doubled since the 1970s.