Where did you hear there was an OCMJEA 6 beta?
When I look at the list of
beta exams. (choose United States as country in case this matters), I see the following four:
Java Platform, Enterprise Edition 6 JavaServer Pages and
Servlet Developer Certified Expert Exam
Java Platform, Enterprise Edition 6 Enterprise JavaBeans Developer Certified Expert Exam
Java Platform, Enterprise Edition 6 Java Persistence API Developer Certified Expert Exam
Java Platform, Enterprise Edition 6 Web Services Developer Certified Expert Exam
As for studying, the
JEE tutorial and JEE 5 exam materials would be best. A beta isn't going to have many (if any) resources because it isn't out yet.