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 dont 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. Dont rev the engine when accelerating or stomp on the brake (i.e. be smooth when accelerating/deaccelerating).
Thats all I can thing of right now, but if I think of more I will post again. Hope I helped.