My own preparation of SCBCD
- EJB 3.0 Specification (yeah, it is. I read it)
- Mikalai Zaikin's notes (http://java.boot.by/scbcd5-guide/): mostly for reference to which part of the EJB spec I should read.
- EJB 3 in Action (when I started moving from EJB 2 to EJB 3)
- Sun's Free Assessment (http://in.sun.com/training/certification/assessment/091-Jintro.jsp): you can check the answer here or locally here
- Javabeat's mock test (http://www.javabeat.net/products/cert/scbcd-5-0.php): note that correct answer to question 7 is A, C, D