One more thing: you should try to download this Ivan Krizsan's study guide
https://drive.google.com/file/d/0B-0LAG21gaGDN3Jkblk3RnpKMmc/edit?pli=1
It is very helpful.
You can visit this EJB forum more frequently. Our posts are helpful too.
I personally think one month is not good enough if you are new to EJB 3.1. I have been preparing for this exam for 13 months , spent 2-3 hours a day studying.
I have two more days left before I take my exam. I can share my study experience with all of you if I pass it. I am keeping my fingers cross now.