ADHD Testing: ADHD is marked by a pattern of inattention, hyperactivity, and impulsivity. Children and adolescents with ADHD, however, experience these symptoms repeatedly and in a way that is severe enough to have an impact at home, at school, or in social situations. Problems with executive functioning are common in children with ADHD and include difficulties with planning, organization, strategizing, paying attention to and remembering details, and managing time and space.