I would suggest you to study for Web Component Developer exam and then move on to EJB and JPA. You will appreciate the fitment, purpose, and benefits of EJB/JPA better after you understand how JSP/Servlet work and where they fit.
Of course, studying now doesn't mean you have to take the old scwcd exam right away. Basics of the new version are still the same, which you anyway have to understand. Once the new exam is out, you can study the new topics (they are not that hard once you know the basics, which again, are same), and take the new exam