How can one prepare for something that he cannot anticipate. Unless the "twists" are just twists used in older games, whether or not you can appropriately handle the twist is a toss up.
The best they can do is give you a refund so you can retake it. Unless proctor/testing center is absolutely egregious, nothing else will change -- at least from what I've heard.
Yeah I didn't quite get that part either since it makes it sounds like you're from the suburbs of the same city, but somehow they're in a different state. Unless this is some sort of Kansas City mischief, I'm not sure how this works.