1. Student A in Case Study One displayed traits of ADHD such as inability to remain seated and follow instructions, repeatedly getting up and bothering his classmates when the teacher's back was turned. This disrupted the lesson and frustrated the teacher. 2. Issues that arose included disruption of classroom instruction and agitation of other students. The teacher shouting at Student A also caused the student to become upset. 3. To improve the situation, the teacher could have seated Student A closer to his desk, used nonverbal cues to redirect him, or set clear consequences for undesired behaviors before they escalated.