You’ll need two golf balls and eight tees for this drill. On either side of the hole, place a tee at 3 feet from the cup. Add an additional tee at each foot further away until you have tees at 3, 4, 5, and 6 feet from the hole. You are competing ball against ball. The aim is to hit one putt at a time from each side of the cup. Start at 3 feet and work your way out to 6 feet and back in. See which side you are able to complete first. You should vary between up versus downhill and left to right versus right to left, seeing which putts you are better at. I think you will find with this simple drill you will significantly improve your putting inside of 6 feet.