[Jon Stratis]

One of my favorite drills is to take two robots, two drivers, and pit them against each other. One plays offense, the other plays defense. Play the actual game your "offensive" robot was designed for, with maybe some small modifications to account for the fact that you're on half a field with only 2 robots. This will help you learn how to deal with pushing matches, how to navigate around a defender, and what sort of limitations your robot has that you might want to avoid next year.

Otherwise, obstacle courses are great, as are game-specific drills (for example, pick up 3 balls, shoot them, them balance on the bridge).

Just keep in mind that it's not all just about being able to drive - you have to be able to interact with the game pieces, field elements, and other robots as well!