As you start playing against better competition you will have to account for the help defense stepping up on the drive. The diamond drill is great for simulating that by making you do the same move multiple times in a row. You want to be quick and explosive with your moves, while still remaining under control and seeing the floor. Also, you are going to work on using pin down screens, and learning how to move without the basketball. Great scorers are able to master both and learn how to score within the offense. Basketball drills like this are great because they work on multiple things at the same time.