I found test difficulty moderate to high. I missed only one question on GC. (did not get sufficient time to review all the questions.) I used Kathy and Berts book, the test on CD, Marcus Greens 1.4 free test and Khalid Mugals free test, and Java Ranch Roundup tests. My humble suggestion is to Read books, and practice different tests untill you start to get good scores (80 and above). Don't appear for test if you are not confident. Finally Many thanks to members of Java Ranch, the SCJP forum helped a lot.