I took the exam this afternoon( March 19th). As soon as I got home I did the trick with a invalid cc( it is a cc that the info was stole by someone, I called the bank to canceled it already, so the payment should not be able to go through with this card). After I filled out all the payment info with this invalid cc, it showed" cc is invalid". However, I filled out the payment info again with the same card, and then I got a good pop up. It said" our records indicate that you have recently scheduled for this exam, other registration cannot be made at this time". After about 6 to 8 hrs, I tried it again with the same cc, still good pop up. So anxious now, not sure pass or fail>_