Distractibility is a big issue for people with ADHD. They don't have enough activity in the area of the brain that controls attention, said Ari Tuckman, PsyD, MBA, a psychologist, author and ADHD expert. That means you have a harder time filtering out things you don't need to focus on. "So a kid dropping a pencil in class pulls at attention just as much as the teacher announcing the next test." The ADHD brain also is constantly scanning for more stimulating things, said Dana Rayburn, a certified ADHD coach who leads private and group ADHD coaching programs. So often anything…