Perhaps you can speak to the teacher and come up with a plan together. Getting the teacher to help you brainstorm a solution often makes the teacher feel like part of the team, and more invested in the outcome. One thing that I've seen work very well in situations like this, is when the teacher gives an unmotivated student the chance to be a leader at something. In first grade, this could be something like being the official "teacher's helper" who collects the work when everyone is done, or explains a concept to the class (after practicing at home), or brings a special math game (you can print one out from the site- http://www.education.com/activity/first-grade/addition/) or maybe you can come in and share something with the class (kids often feel really proud when a parent leads an activity or project). Sometimes, it's not so much the thing that you choose, it's just the fact that the child needs to feel good at something, and singled out as special. For example, we had a kid in our class this year who got put in charge of making sure a kindergartener got to his parent for pickup each day and that had a huge effect on him academically. It just made him feel trusted and important, when during the day he didn't always feel like the leader. And it helped a lot.

I had the same problem with my very intellectual grand daughter aged 6. Though she is blessed with an very high IQ there is a problem. Have your child tested for dyslexia. They are very intellectual but have a different wiring system in the brain. They need different learning techniques. Might possibly be your problem. Concentration is also a problem. The biggest problem we have with this is that the normal teaching methods make no sense to them and they become bored and find things very difficult (might even think they are stupid) . Yet, once you have found the correct teaching methods they perform very well and are capable of completing two grades in one year. I have the impression your child is just to bright and that he is not receiving what he needs.Try this website to establish if this method might work.