Paige speaks about the importance of achieving the sit position in the air. If you do not you can lose very important features that will leave you with very few points.
You will hear the easiest way to tuck by pointing your toe on take off making tucking easy. This helps your heel come up thus giving you great tuck.
Then see how to use the doorway to do walk trough’s and this helps you with your upper body position. Keep your core strong, and jump straight up and down making the tuck easier.