Increasing your son's medication will not help his motivation. Many children diagnosed with ADHD have high IQ's, and the situation is much as you have described.
Unfortunately, hiring all the personal tuition under the sun is unlikely to help as the difficulty is not his understanding.
Developing a reward system, where study time and coopertaion in class are both required to be rewarded may help. You will need the schools cooperation here too. At his age, rewards can take the form of sports outings, movies with friends etc. The difficult part will be in denying him his reward if he does cooperate: for example if he has been working toward tickets to a rugby game and he does not achieve a realistic gal for a test, he does not get to go to the game regardless of how much the tickets may have cost hopefully they can be sold).
If you require more assistance on this matter, and are in JHB or CT, please contact me via Email.
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