OK, once again, I have to do my "you got a good score!" thing. Bobby, you need to trust me on this one, I *do* know the scores that people get on this exam, and 72% is good! I know that on javaranch, we have the top of the top of the top -- folks who are able (or willing) to spend a lot of time preparing well, but I swear that outside javaranch, lots of people do not even pass at ALL let alone score something over 70%.
I won't mention the exam, but waaaaay back in the early days, there was a Java
exam in which I scored a 73%. While speaking with other exam developers at Sun last week, several people revealed the scores that they had received on various tests. One of the guys who got a score not much better than yours was the guy who is now the author/developer/creator of one of the J2EE specifications. It really just depends on how much time you spend studying. In the end, if you're going for certification, you passed and that's the good news!
Whether you believe you need to take more time to learn things in more detail when you're doing EJB in the real world, is a different story, and at least now you probably know which areas you might want to brush up on.
Be happy about passing and about your score! You would not believe how many people do not even pass that exam.