I've done 3 of those so far, and my regular breakfast has always been fine (2 thick pieces of quiche consisting of about 4 eggs, spinach, bacon, sausage, and a bunch of mixed veggies). Energy wise you should have no problems. It will depend a lot more on what you've been doing for physical conditioning, so hopefully you've been as faithful with that as you have been with PB.
If you've been doing any crossfit style workouts for 3+ months, then you should be very competetive. If your area is anything like where I am in Southern California there will be hundreds of applicants there for just a handful of positions, so do your best and try to enjoy it without stressing over the results.
Good luck and have fun!