You might get more cooperation from dh if you sit down together and make a list of measurable goals. For instance:
1. Ds's attitude toward authority will show improvements.
2. Ds will demonstrate mastery of increasingly difficult subjects through the use of testing or papers.
3. A pleasant educational experience for your son will result in less stress on you, therefore a happier home for all.

Keep your goals low, so they are achievable. Success begets success, and it's easier to raise goals than to lower them after you start working toward them.

Make a thorough evaluation of your ds's behavior, mental outlook, achievement level. List some things that will help you achieve your goals to help him grow. Group lessons helped our GS because I could reinforce the teacher's authority, remove him if necessary, encourage when needed. Individual lessons worked well, too. GS's taken ice skating, art, piano, in Scouts & 4-H.