I would ask you to calm down, but clearly that isn't happening without calling up Mary Jane, which you shouldn't do anyways - they might immediately disqualify you if they smell it.
Remember your past mistakes, every action you take in the car, think before you act that it's the correct action.
Be wide awake and alert, always looking around your surroundings, in your mirrors, and notice how you're driving.
1. When driving, drive at near the speed limit, within 3-5 kph of the speed limit (maybe 2-3 mph if you do miles instead). Always. That way you won't be speeding or too slow; of course this means you'll have to always glance at your speedo to check.
2. Secondly, pay fucking attention to the signs on the side of the road. You're good for slim pickens if you suddenly enter a school zone without decreasing speed, rolling past a stop sign, or enter a freeway without noticing to increase speed. Failing to notice signs are among the easiest ways for your examiners to dock you points or fail you.
3. Use common sense when entering areas of high human activity, like near crosswalks or passing strip malls. People often just jut out and jaywalk, so...
4. Parking, particularly parallel parking takes a lot of steps when you're not familiar with it yet. If you're fuzzy on how to park, brush up on that. Parking is often the most difficult and complex task when you're first tested for your driver's.