Kids at this age with normal practice usually can't

reach the coordination level to get good strokes.But we can work on it to get it improved. The idealest is to have a partner and a private coach. second best is to join a group4-6. Breakdown their weakness into small, measurable targets, do them one by one. It will all come along. Strongly agree with RAINING2006, as foundation, should build strength and endurance first.