The more you can make practice like actual game situations the better the student will respond when in competition.
My favorite short game teaching aid is the golf tee!
The golf tee is such a versatile teaching aid that you can use it in a multitude of ways.On the green I use it to make the whole smaller to make a gate to put through when teaching green reading. Placement for controlling the length of the backswing and the follow-through. I set up putting practice courses by using the tees as markers for predetermined length putts with a score for the course so that game like conditions are created. Chipping as markers where to land shots for proper roll out to target.