Okay Nirvana here is your serious reply.
My Dad has been a driver examiner for 25 plus years and was a member of The Queen's Cowboys so I guess you could say I kind of know what is expected from all the stories around the dinner table of how often new drivers on their tests suck. I also learned how to drive a little differently than most teenagers.
1. Right turns. This is where most people screw up. Get in fairly tight to the curb and "smear" the corner of the parking lane on the road you are turning right onto. You arent driving a tractor/trailer or a bus. Dont swing out from the curb and make a "square turn." (Left turns you want to keep fairly square.)
2. When changing lanes, it goes MIRROR>>>SIGNAL>>>SHOULDER CHECK>>>MOVE. Dont forget that.
3. Yeah, it matters where your hands are. At least here, if you dont have both hands on the wheel, you are gonna fail. (If you have a manual transmission, it is okay to take your hand off the wheel for a moment to shift, you need not use your teeth.)
4. Watch uncontrolled intersections. What I mean is a 4-way intersection with no traffic signs. Dont know if you will encounter any of those on your test, but never hurts to be prepared. Slow down and cover your brake. Be prepared to stop. Remember, person on the right has the right of way.
5. On the subjest of jay-walkers. Dont just stop for them. If they are gonna walk out in front of you outside a crosswalk or between corners or whatever...use the horn first, then if they insist on walking out in front of you anyway, then stop. Here, you will fail your test for stopping fir a a jay-walker without using the horn first.
6. Make sure everything on your car works. Eg: Horn, lights, seatbelts etc. And make sure your car is clean and doesnt smell like a gym bag...This is more important than you might think.
7. Parrallel parking. This is a killer unless you can do it smoothly. Notice i didnt say quickly and perfectly...just smoothly. I assume your instructor showed you where you should be when you begin the parking process and all that...The only way to get good at this is to practise. (Btw i cant parrallel park my car if my life depended on it.)
8. Watch out for reduced speeds in school zones. You will prolly be nervous and be so focused on the million other things you are trying to do perfectly that you might speed through one of these school zones. You do, you fail. Drive way too slow...you fail. But like someone said above, dont focus on that speedometer. Or your hood, or two feet in front of your car. Low-aim driving is dangerous.
9. If at all possible, take the test in the car you did the majority of your practise in. You dont want to be fumbling for stuff like the horn or signal actuator.
10. Someone mentioned complete stops. Very important. Now this will be tough because from what I see, most people do the "slow and go" at stops signs. Be sure to make a complete stop. You will feel it in the small of your back/tailbone when you have stopped completely.
That is just some stuff off the top of my head, if you have any specific questions, feel free to ask.
Good Luck.
(edit) And dont worry, the day after you pass your test, you can drive like a complete idiot like the rest of us.
Loser.