I said it before, and I'll say it again. Knowing the rules is the foundation of becoming a good judge. Knowing the rules is (by far) not sufficient to become a good certified judge. If you score decent on the Delphi test, you have a decent chance on passing the *written* test. After that there's still the practical part and the interview.
In fact, just to back up what Jaap is saying, it's these latter qualities (the part outside of knowledge of the rules and official documents) that are the most important to be demonstrated. Lots of people know the rules inside and out, but what makes a good judge has to do with qualities that no written test can actually measure.
Anyone who is interested in testing should talk to their local Level 3+ (if they have one), or go to the DCI's webpage and read the article on becoming a judge that is posted there. That should give you a much better idea of what it is to be a judge and what qualities the judge program looks for in candidates of all levels.
Jaap
(level somethingish)
Level somethingish my...
