Hi Mahmoud, if you have solid working experience with EJB3 and JPA 1 that won't be a problem. Just go through Mikalai's guide and do some mock exams like Enthuware and
you should be good to go. However if you don't have any
EJB experience, it will be a tough task. EJB3 in action is a good book to start with .
Please check experience of other ranchers here and you get an idea of how much time it takes to learn EJB3 and JPA. Wish you all the best
SCJP6, SCWCD5, OCP-JBCD5, OCE-JWSD6 OCE-JPAD6 , OCM-JEA5 1,OCM-JEA5 2,3,OCJP8 - Brainbench certifications: J2EE, Java2, Java2-NonGUI, JSP, SQL2000 Admin, SQL2000 Programming , Brainbench certified Java Programmer, Computer Programmer, Web Developer, Database Administrator