Even if she did not study hard, she's Stanford's dean, she has already taken two states bar exams and you just can not attribute her failure to her lack of preparation. Does the definition of "assault," "battery," "specific performance" and the like change over time, or from state to state?! Does California have a much different definition of "principal in the second degree" compared to New York?! Not really!
Do you know that Hillary Clinton did not pass the District of Columbia bar exam on her first attempt? In fact, it was because she passed the Arkansas bar exam, but not the DC one, that she chose to follow her heart instead of her mind, going with Bill Clinton to Arkansas, rather than staying in Washington where her career prospects were best. During 1974 she was a member of the impeachment inquiry staff in Washington, D.C., advising the House Committee on the Judiciary during the Watergate scandal, which culminated in the resignation of Nixon in August 1974; by then, she was viewed as someone with a bright political future -- Democratic political organizer and consultant Betsey Wright had moved from Texas to Washington the previous year to help guide her career thinking she had the potential to one day become a Senator or President
You seem to believe that Clinton is smarter than Sullivan. Well, that certainly does not have to be the case. Clinton may be politically-savvy, but that does not necessarily mean she's better "brains" than Sullivan.