Did the
test yesterday and passed!
I didn't buy a study guide, still paying off those student loans in university =) Since I am working full time with crazy schedule I study on-and-off for 2 months, basically doing a lot of mock exams, reading javadocs and JLS, and reading the forum here. At first my average was about 50% in most mock exams, but I was about 87% when I write the exam.
I guess the only advice I can give to those who hasn't write the exam is to read the questions carefully, and read it twice. More than once I almost got a question wrong because of subtle things like not noticing "static" is missing in public void main, for example. There are lots of time to review at the end and it's a good idea to review multiple times.
Thanks a lot to people in this forum for all your help! On to the web developer certification...
Adrian