You must try
ExamLab. It will prepare you thoroughly for the real-time exam. Re-go through the K&B book.
And concentrate on it, what it is saying. Believe me, every statement has some tip. Being a
java programmer myself,
when i started i just skimmed through the surface. When i started tackling the exercise problems, every self-test question,
scoring 50%, rest will go wrong due to one silly mistake or lack of concentration. Later i started visiting java-ranch regularly,
and after one question or the other, i started feeling, there is something lacking. Am i not prepared well, or may be exam is too
hard. Then i silently reading K&B again and with proper concentration and found out, it was my mistake, i took the theory too lightly.
That is why i had to drop the exam one time. So before judging anything, re-visit all concepts again and then try for Master Exam,
you might not find it that much taxing.
Just a tip and experience i am sharing.
Best Regards,