Try saying your last name first, followed by your first name. Most places look you up based on last name anyway, so it's not an odd thing to do it that way. I always do last name first, because for some reason, I don't stutter when I switch the order around. Also, this post taught me a new word: invigilator. I've never heard that term before—I've always heard of those people referred to as "proctors"