K.B.
I would look at three things first...
1- Is he being bullied? Is there a child in the class that is bothering him?
2- Does he have a crush on a gyrl? Very distracting, indeed...:)
3- Is he bored with the work? And are they just giving him busy work instead?
The school system is made up for the average mainstream child. They are not equipt to handle gifted children (most are not-I should say). They tend to give these children busy work that does not spark their minds.
This is the reason why more home educated children are either what would be considered "gifted" or "special needs" by public school standards.