In dealing with children who are experiencing difficulties maintaining focus in the classroom, there have been some time-proven strategies that have weathered the test of time.
Consistency is the key to helping children.
Children with focusing issues are really poor at dealing with change, even if it is positive change. They need tohave a sense of external structure, as they tend to lack a sense of internal structure. They are usually poor at organizing their time and need you to help them break tasks down into small components. If the child is right handed, placing them at the right front of the class minimizes the number of children they watch wiggle when they write. Try to avoid placing off-task children in loft classrooms or in situations with multiple children at a single desk.