I have the Osborne Press book Java 2 Sun Certified Programmer& Developer written by Kathy Sierra and Bert Bates.
I am confused, the book says you need to answer 32 out of 61 questions to pass the Java Certified Programmer exam (310-035).
However the CD that comes with the book contains a cd exam from LearnKey. I took the LeranKey exam and answered 49 of 65 questions correctly but the software said I failed. It seem to indicate that 80% is the score you need to pass the exam.