Hi guys, I got 81%! Thanks for all your postings! It really helps me a lot! Actually I used my spare time to study in the past two months(Sat & Sun are not spare to me). I read Java 2 Certification Guide once. Then I took the mock exams from jhcq. My scores are in the range 55-65. Then I read some study notes and visit JavaRanch frequently. I retried the mock exams and got ~90. Finally I've got the real exam yesterday. I think the exam is more difficult than the mocks from jhcq - 30% more!