When I started my engineering degree the head of the department said the following "look to the left of you, look to the right, both of these people will not complete this degree." Meaning, only 33% who start that degree complete it. It's tough, and the upper division classes are weeders, culling the weak, and ultimately giving more prestige and value to the degree and those that complete it. Same is true with an ATP, I believe, it takes a lot to make it that far, and to pass all of the test. Also I would agree, that anyone who has made it to the point of taking the ATP, has already decided to pass and applies themselves fully to it.