I was so nervous taking mine too. I would suggest always going the speed limit, look over your shoulder when backing, know where all the things in the car are located (lights, defroster, windshield wipers etc.), when turning into lanes don't swing to wide into the wrong lane (turning right get into the right lane, when turning left turn into the left lane).
Also as soon as they tell you to turn turn on your blinker. Know what to do at all stop lights. Stop completely at all stop signs. When you park uphill put it in park, put the parking brake on and turn the wheel all the way to the left. Look in your mirrors every ten seconds. Exaggerate looking both ways when turning, or at stop signs/stop lights. Don't rev the engine when accelerating or stomp on the brake (i.e. Be smooth when accelerating/deaccelerating).
That's all I can thing of right now, but if I think of more I will post again. Hope I helped.
2. Keep enough distance between your car and the car in front.
3. Don't always assume intersections have stop signs. I failed my first drivers test because of this. I was in a new city, unfamiliar with where I was going and assumed this one big intersection was a four way stop since it seemed like the logical thing but it wasn't. :(
4. Stop. Don't roll through stop signs!
5. Make sure you know how to operate everything in the car. (Lights. Defroster. Parking Brake. Emergency Flashers...)
6. Don't forget your blind spot!
7. Don't talk to the driving examiner unless they talk to you. :)