You might want to get Mark Cade's SCEA Certification Guide. It is not very detailed, but it covers all topics and is one of the books that is useful for all the certification steps.
For further reading, it is also good doing some internet research for useful articles. There are some good SCEA preparation notes like "Ramu's notes", searching this forum should give you the pointers how to get them. Personally, it also helped me a lot for part one to practice the Whizlabs exam, it also contains a brief overview over the topics in part 1 which was helpful.
"The UrlyBird catches the certificate. And he's gonna FlyByNight"<br /> <br />SCJP 1.2/5.0, SCJD, SCBCD, SCWCD, SCEA