At home and school, your son will respond well to a predictable routine of things that are done at the same time every day. Have a regular morning schedule for getting up, eating, brushing teeth, and leaving home with school paraphernalia. Be sure to have a regular afternoon and homework routine, too. A checklist can make it easier for him to follow the routine. Plus, it is extremely important to teach him organizational skills.
You should work on building your son's attention span as it will pay dividends at school. Play simple games such as Parcheesi TM and UnoTM that require him to pay attention. As his attention span improves, try checkers and chess. It would also be wise to limit his television time as it does not require close attention.
Remember, children model their behavior on what their parents do. Are you always rushed? Do you really listen to people? You need to model attention paying skills. Having a relaxed evening meal in which every family member shares conversation and really listens is an excellent way to teach this important skill.