For those out of the loop, the exams are now computer based multiple choice. This removes errors like marking the 'X' in the wrong place on a hard copy piece of paper. It is marked instantly and the result is displayed on the screen within 20 seconds of hitting submit. The likely hood of being marked wrong is slim to none, unless there was a bogus question in there somewhere.
As for the KDR:
KDR without syllabus items
A candidate who obtains a 100% score in their CPL examinations will not have any syllabus item on the KDR.
Similarly, a candidate who scores 50% or less will also not receive any specific syllabus items on the KDR. CASA considers a candidate who fails to achieve at least 51% as not being sufficiently trained nor prepared for the examination attempt. Such a performance requires a complete re-visit of the entire syllabus for the subject if re-training is contemplated. Therefore, a candidate who fails to achieve at least 51% in a CPL subject-part examination shall consider the entire syllabus for the subject material to restudy for the KDR.