I feel your pain. My son is only 6 and sounds very similar to your son. I was a hyper kid but I could focus and sit still. My child can sit- but his mind is somewhere else.
We are here to support each other. One day at a time. Get him to do one thing. Something is better than nothing. I have learned that having a good relationship gets mw somewhere with my older child (who is very strong headed and procrastinates)
One task at a time.
Each day is a new day.
The ADD wants us to give up.
To get tired and let go of our children.
Be there. Very patiently.
It is a challenge.
For all of us(some of us tolerate less than others)