They think they failed because the questions they got were hard and they did alot of guessing, so if they had failed, they had to fail miserably for the computer to decide you don't have a chance...even if it gave you 190 more qustions.
I took mine sept. 5 at 9 am and I am so scared. I had 75 questions but I don't think I did well. Hopefully by in the morning the results will be ready.