First and most important TRY TO RELAX. 8^)
When you turn or stop or change lanes or pull out of a driveway or anything, look all around. Don't trust your mirrors, look over your shoulder. Make a big show of looking around carefully before making any changes.
When the inspector says something, stop and think about it for five seconds or so. Take your time. Don't look like you're in a hurry.
Hopefully you've driven around for a while, you know how to make a left turn, how to merge with traffic, all that stuff. Just be careful and drive like your grandfather. 8^)