Answer:
Attention Deficit Hyperactive Disorder (ADHD)
Explanation:
Attention deficit hyperactivity disorder is a neuro-developmental type mental disorder in children and may continue in adulthood.
It is marked by Lack of attention, hyperactivity and acting differently with regards to consequences, inappropriate for the age of the person.
The person with ADHD is not focused both at work and at home.
Thus the case of Robert, where he finds it difficult to focus in class, distracted, hyperactive and impulsive, all shows the sign of Attention Deficit Hyperactive Disorder (ADHD).