Although, taking a few shots from elevated is always a good idea for practice, it is not entirely necessary. If you have good form and remember to bend at the waist instead of dropping the arm and changing your anchor point you will hit your mark every time. You can practice form from a treestand from the ground with a small target 2 yard in front of you. This will give you a replicated form from a stand. Remember to use your 40+ yard pin for the close shot or you will shoot over.