Most kids are pretty good at procrastinating, I myself am a pro at it, but kids learn at a young age how to sneak around those tasks that they just aren't in the mood to do. This can make your time with your student inefficient. So ask yourself these questions and see if you are dodging the procastination cloud that might be hanging over you and your student.
Are you using a planner? We hand out free planners to each of our students here at CGTP at the beginning of the year and most schools hand them out as well. Get your student writing down due dates, assignments, and projects in their planners. Show them how to do this neatly and orderly so that they can read and understand everything they put in their planners, otherwise a planner is useless. If your student needs a planner come find me, asap!
Are you prepared for "what's next"? Once your student finishes their homework for the night, you should already be thinking of what your student is going to do next. Leaving it up to them, usually leads to less educational activities taking place. Have things planned out ahead of time, so that there is no gap in between work that might lead to less important activities.
Is time against you? Teach your student that timeliness matters and is important in every day life. In order to get work done in a timely manner, set a timer (you could even use a timer on your phone). Set the timer for fifteen minutes and they must work until the timer goes off. You would be surprised that students will often continue working after the timer ends, because they want to finish, and once that get started that first initial hurdle of starting work is now over.