The main thing for me is to work with them one on one. Pull them out in an inconspicuous way and help them get it down. If you have to arrange a meeting after or before school..then dont be afraid to do so. Some times with my cadets, they just have no motivation to do drill...If you put them on a Team or reward them when they get movements right, then they have a reason to work harder to get the drill down...My cadets are performing much better now that i put them on Drill Team and they have some reason to strive for(ribbons to go on their empty chests). But like i said the main thing is working one on one and helping them personally.