Ummm, I can suggest taking a small vehicle. I took it in a 2007 Chevy Tahoe LT3 with 20 inch rims (if that makes any difference). I can tell you I which we had a smaller vehicle at the time, I did past though. But it was very close and strongly urge you to take the test in something small and agile. Drive for a bit a few hours before test, but don't drive getting close to the test. Relaxing does help, you don't want to be stiff. Also depending on the location you will not have to take to parallel park, as I did not. I only did messed up three(3) time.
1. When we had to do a three point turn, since the Tahoe has a sharp turning radius. I was able to do it in one turn, but that was not what they wanted. It was not a biggy, they did not count it. I just had to do it over again. (Use you left signal)
2. When I was backing up, I failed to look behind me. I used the onboard camera on the dash, along with the backup sincere. That is not good at all, you have to look behind you.
3. After I completed the test, I had to park up front. But I failed to use signal turning into the parking lot.... So remember even when you think the test is over with, it's not.
So I only got marked twice, all in all I passed. I also have a safe driver mark on my license. Therefor it lower my insurance, very handy at a young age.
Also the tester is a trained bitch....
I hope that helps!!!
~Steven
Edit: Also call and set an appointment, you don't want to sit around and wait. Allot of people fail it there first time, so don't feel bad. But all the people coming in who failed tend to cry... It may get you nervous, so I would set an appointment.
Also bring in a good quality car, as they do check it out. All safety features have to work, as they do from the factory.