Hi Anut,
The score for my first attempt was 53% and that was after studying the Sun tutorial, doing Marcus Green's exams which is probably the reason for not getting less, and whatever I could find online, e.g. the SCJP forum here, exercises, and various other mock exams, etc. The other book I had, SAM's teach yourself, is nice but not really geared for the exam.
The
boost in % second time around came from Kathy and Bert's SCJP5 book, and more mock exams, but K&B especially, their exams and the downloadable LearnKey master exam.
Best,
Rudolf