Lack of mental confidence which encourages a fear of exams leading to a denial of service.
I have had guys in the class who get terrified and complain that the teacher isn't any good, but what they are really saying is that they don't understand and this chap out the front is making me look a fool.
The big problem is that the daft buggers who call themselves managers, believe them.
For all those out there who are looking at taking this exam (although I thought this one had finished) You only have 4 days in which to get your head around GN3 as well as your basic level 2 Maths and English comprehension up to speed and then you only have 2.5 hours to answer 60 questions for part A and 6 questions for part B, so you need to hit the ground running.