SD08 and I will continue that thread in private, but a general comment about exam design.
When creating multiple forms for an exam, the forms must be equated. The topical weightings are the same, the average difficulty of items is similar.
This goal of equating is to ensure that 2 people with the same skill/knowledge taking the 2 different forms will get the same score. Or if 1 person takes multiple forms and their skill/knowledge hasn't changed between the attempts, they would get the same score. We call this Reliability. See also test-retest repeatability.
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