Take your practice round like the pros:

Play target golf - hit to specific spots on the course.

Hit shots to leave yourself your favourite distances from the green - if you like full PW shots, hit drives and approaches to put yourself in that vicinity.

If you can, play two or three shots from the same location, and shape them differently to see how they react.

Remember for putting, speed is more important than line - learn the greens.

Like Althouse said, if there's bunkers, practice in them. It might be good to bring a few clubs into the trap.

Short game seperates the high score from the low score. Make sure you spend at least half of your practice hitting pitches and chips.

Good luck at your comp!