You stated earlier how he got that A. He has sugar in his tank.....if you get my drift.
Yes, hyperactivity is his symptom. Here is a list of hyperactivity symptoms...
"Hyperactivity is a state of excess activity that may be manifested as fidgeting, jumpiness, nervousness, or excessive movement. It is often accompanied by difficulty concentrating or focusing on a task, excessive talking, or difficulty remaining quiet in school. However, it is important to distinguish true hyperactivity from the active and impulsive behaviors exhibited by normal children."
Note the excessive talking symptom, he fits that classic symptom.
Could be too much sugar though I guess.