When the mind is focused the task is completed.
  Funny isn't it that when we truly focus on something we seem to receive it or achieve it.At our academy www.yarmmartialarts.co.uk we emphasis the importance of focus and concentration and get the students to understand that we have to do this to achieve anything. It surprises me time and again by just directing the student to be aware of this the improvement can sometimes be dramatic.
 We have students whose parents brought them to the academy, not so much to learn martial arts but to understand focus and concentration. When the same parents come up to you and thank you and the team for the change in their childs focus it makes the job worth while.
 So what do you do, basically keep going back to the point that their actions create their results, using a never give up attitude creates a successful person in whatever they choose to do.By just explaining in a calm way when they enjoy something how focused they become compared to not enjoying a task when their mind wanders.
 We all do this and that's why sometimes to focus and concentrate is difficult and must always be watched and nurtured to develop a mindset of focus and achievement.
 The only way to get this is by helping the child or student to be aware at all times of their  awareness and focus, in practising like in the martial arts as much as possible and then to build up to a focused and understanding mind.