Use difficult situations in the child's day as opportunities to teach the child and give feedback. Make your and the schools expectations very clear. If the child appears to have difficulty with social skills and appropriate behaviors. It would be very useful to analyze just what skills are lacking and then teach or coach the child in these skills. Make a game out of things.
Motivation improves focus.
Pay particular attention to who sits next to who . Your life will be much easier if you can keep the child engaged and motivated. Time spent planning activities to make them as engaging as possible will be repaid many times over. For instance the use of daily reporting sheets can be very effective. More effective still if the child sets the behaviors to be monitored.