Your scores on each beer are compared to the Proctors and your Scoring component is simply based on the total variance from the Proctor’s consensus.  Your goal should be to get within three points of the Proctor’s consensus.  In my opinion, a good Exam Admin should not give out a “13” stinker on the exam, primarily because many examinees will focus on the major flaw and ignore the rest of the beer.  Also, by nature, everyone is looking for flaws on an exam, so 42-ish might be the high-end of most-likely scores.  Use the Scoring Guide to peg each beer into the correct range, and then determine where it fits within that range.  Offer Perceptions on each of the cue words listed on the score sheet, including such points like finish and balance.  Check your math at least twice and focus on Descriptions, Feedback, and Completeness, the sections over which you have total control.