Inattention, hyperactivity and impulsivity are the core symptoms of Attention Deficit Hyperactivity Disorder (ADHD). A child's academic success is often dependent on his or her ability to attend to tasks and teacher and classroom expectations with minimal distraction. 

Such skill enables a student to acquire necessary information, complete assignments and participate in classroom activities and discussions (Forness & Kavale, 2001). When a child exhibits behaviors associated with ADHD, consequences may include difficulties with academics and with forming relationships with his or her peers if appropriate instructional methodologies and interventions are not implemented.

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http://www.ed.gov/rschstat/research/pubs/adhd/adhd-teaching.html