Not just humor, but the overall tone of your application essay is remarkably important. It's also difficult to get right. When you are asked to write about your accomplishments, those 750 words on how great you are can make you sound like a braggart. Be careful to balance your pride in your achievements with humility and generosity towards others. You also want to avoid sounding like a whiner -- use your essay to show off your skills, not to explain the injustices that lead to your low math score or failure to graduate #1 in your class.
After going through every item they released in detail, I noticed patterns emerge. The most noticeable was that the bar examiners tested some material more frequently than others. For example, whenever a Civil Procedure question appeared we found that approximately forty (40%) percent of the time a component of the question dealt with the Diversity Subject Matter Jurisdiction rule. Since this rule is tested frequently, it makes sense to spend more time memorizing it than, say, the Depositions rule, which appeared only once in the last 23 years.