I agree with Spitoon 100%. Take note of Bright-Lings comment about "verbatim" answers.
Unfortunately, in my opinion, the written exams are more about how good your memory is, rather than your understanding, of a topic!
This can lead to the situation where someone can pass a written exam with flying colours but fall down on the oral or practical.
So, sorry to be so negative, just because a candidate is good at the bookwork there is no certainty of that translating into being good at the job.