Hi David,
Are you saying that this has happened to you, or are you just raising a concern?
Personally I found that every question on the exam was one that I had already covered in my design document, and so my answers in the exam matched.
And I think that is what the examiner is looking for: making sure that your exam paper and what you submitted matched. What you actually write is in many ways irrelevant.
And that would lead to a tip for anyone about to do the exam: when answering questions in the exam, dont start inventing reasons for why you did something in your assignment, because then your answers wont match.
If you have actually failed the exam, then I think you may have to ask Sun about whether you can just resit the exam. The address is
[email protected].
Regards, Andrew