In our association, the test is take-home and open book. There is also a scheduled test review scheduled prior to the due date. The point of the exam requirement, here, is to get all of the officials into the rule book. Only officials who demonstrate that they have completed the exam may attend the test review, and officials need to include rule references. It is possible that we have some officials who cheat, but since the score on the test is not made public, there is little reason to cheat, unless the official doesn't want to open the rule book at all. Those officials tend to work only low level games anyway, I expect. I don't know what the minimum score is, but I believe that a low score would preclude an official from officiating at all.