Practice your focus

ADHD is somewhat of a misleading term because many kids or adults with ADD or Adhd are not hyperactive. Often is it quite the contrary and the label hyperactivity disorder tends to complicate the definition of attention deficit. Even though it is more difficult for someone with ADHD to focus at times, significant improvement can be made by practicing your focus. Your ability to focus can improve just by the fact that you are paying attention. One way to help cope with these difficulties is to shorten your times needed to focus by taken breaks for set periods of time. It is important to be careful to not lose yourself on your break and forget about your homework.
Pay close attention when you are better able to pay attention and plan some of your more arduous chores accordingly. If you feel more focused in the morning, try to take some of that focus and put it to work on some homework for example.