Hey ohimai,
I passed the exam last week and was freaking out because I was averaging 60% on the mock exams that came with Kathy Sierra's book.
However, I got 83% on the real exam!
I think I found the real exam easier because they tell you how many answers to choose, which the mock exams didn't, and the questions are shorter.
Of course, I still had to study A LOT to succeed.
Good luck to you.