Lengthen the time between practice sessions as the material is retained. Color cue side of desk or paper or word as a starting place. Gradually increase the difficulty of material to discriminate. If errors are made, go back to simpler practice. Trace hands on paper.
Child follows the directions in drawing lines up, down, right to left, etc.
Use marching as a variation. Child names objects on right and on left. He moves to different parts of the room and repeats. Arrange story pictures in sequence, left to right. Use lined paper for writing.