I don't believe you're given that option by the computer once you are done testing - you can only choose whether to have the score thrown out before you find out what it was (so you never know if you did manage a pass if you choose this option). That's why it's usually not the smart thing to do. If you're really worried about hurting a GPA or having your school see a failing score, you may not want to report it until you see what grade you got. But doing it that way will cost you an extra 20 bucks.