Hi Angeline,
If you have already prepared for OCWCD 5.0, please go for it.
AS OCWCD 6.0 have new topics :
More options for the Model
[ ] Understand the roles of
JDBC and JPA
[ ] Understand the many elements that make up the model
[ ] Understand fundamentals of connecting to a database using JDBC or JPA
Asynchronous web applications
[ ] Understand the interactions that are essential to asynchronous web pages
[ ] Understand the role of AJAX-style client side programming
[ ] Implement asynchronous
servlets using the facilities of
Java EE 6
And also JAAS.
~Ankur