I agree with Vijay.
Personally, I love Howard's book as it is very good for WSAD related stuff. Of course, IBM's exams are so different from SUN's exams because it expected that you have certain knowledge on general issues (SCWCD and SCBCD) before going on a vendor specific exam. Thus, if you dont have J2EE experiences, you might consider to take IBM 484 first, because it requires you to know Serlvets, JSPs, EJBs and various J2EE technologies, like
JDBC, JAXP, JCA, JSSE.
After that, you can read Howard's book because he did an excellent job on WSAD or WAS specific confiugration and environment issues.
You might also consider Vijay's Whizlabs' simulator. It helps you to understand the objectives and your weakness.
In addition, to gain
Servlets, JSPs and EJBs knowledge, I recommend you to read the 2 books:
1. SCWCD Exam Study Kit
2. Head First EJB
These are excellent books for J2EE 1.3.
Best luck for your exam.
Nick
SCJP 1.2, OCP 9i DBA, SCWCD 1.3, SCJP 1.4 (SAI), SCJD 1.4, SCWCD 1.4 (Beta), ICED (IBM 287, IBM 484, IBM 486), SCMAD 1.0 (Beta), SCBCD 1.3, ICSD (IBM 288), ICDBA (IBM 700, IBM 701), SCDJWS, ICSD (IBM 348), OCP 10g DBA (Beta), SCJP 5.0 (Beta), SCJA 1.0 (Beta), MCP(70-270), SCBCD 5.0 (Beta), SCJP 6.0, SCEA for JEE5 (in progress)