so far three exams have been proctored
June '08 - 155 (cold)
Oct '08 - 164
Dec '08 - 164
Here's the thing, I wanted to see if my scores accurately reflected my ability so I took the Oct '10 test at home today, using the Powerscore virtual proctor
173

is this a fluke, or is test anxiety to this degree real? Any advice on how to maintain this score (since i would be more than thrilled with this on test day) btw i'm taking the test in June '12