This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
I did indeed use the Pro JPA2 book to prepare and very good it was too!
I used the Enthuware SCBCD mock exams and just created my own test containing all the JPA questions and the transaction questions, was a pretty good match but as I said the actual exam was heavily weighted to the Criteria API but I assume a large proportion of these questions will be dropped from the real exam.
Christophe is correct, as far as I know the final date to take this exam was 30th September unless Oracle has extended it.