The best drill I have used is the "broken tee drill"

This is a very common mistake. The best drill I have used is the “broken tee drill”. Take a broken tee and place it directly in front of your ball. After you take your set-up, please focus directly on the broken tee instead of the golf ball. Now try and directly hit the tee instead of the golf ball. This will make the swing steeper and allow the club to keep descending down through impact. After your follow through, you will notice the tee gone and your ball flying high in the air.