Stacie,
What positive reinforcements do you have in place for when he does what he is suppose to?
When he gets a good grade... do you reinforce it with something he cares about? Such as: "Get an A and you will earn yourself a new video game".
I know some parents say they won't do this because they are bribing their kids to do what they should want to do.
Per the book, "Analyzing Performance Problems" by Rober F. Mager and Peter Pipe (p. 81):
" Bride is a loaded word, implying something illegal or designed to make someone do something against his or her will. What we are talking about is a positive consequence that, if you like loaded words, could as well be called a reward. By providing a positive consequence, you increase the probablity that behavior will occur. When a mother says to her child, 'If you pick up your clothes for a week, I'll take you to a movie,' is is not bribery. It is the offer of an incentive (a consequence desired by the child) in return for performance desired by the mother."
What is your sons positive consequence for making GOOD grades... for RUNNING... for accomplishing a goal?
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather, to skid in broadside thoroughly used-up, totally worn out, and loudly proclaiming: WOW WHAT A RIDE!!!!"