The current SCEA assumes knowledge of EJB 1.x. SCEA 5 Beta has been updated to also test your knowledge on EJB 3.
I used EJB 2.1 resources when preparing for SCEA part 1 and got all the questions on EJB correct (given very minimal EJB background prior to taking the exam) so I guess it's perfectly ok to read EJB 2.1 specs even though the questions were created for EJB 1.x.
I also found the chapters regarding Entity Beans and Session Beans lifecycle from the SCBCD Study Guide book very very useful.