The SCJA is actually quite easy. If you are an SCJP you only need to know a few things to pass this exam.
Basic UML, there is a free guide for this and a link to it from the SCJA objectives on the Sun Web site.
And secondly, a very high level understanding only of what the
J2EE and J2ME spec involves.
What
Servlets are for??? What EJBs are for and which layer they are in???
JMS and so forth.
I took the beta of this exam with minimal preparation and passed it comfortably.
I do think you need to know about methods of the
String class, but that should be simple for you.
http://www.sun.com/training/catalog/courses/CX-310-019.xml
MCPD (Enterprise Application Developer, Windows Developer, Web Developer - .NET 2.0), MCTS (Windows Apps, Web Apps and Disbributed Applications - .NET 2.0), MCITP (Database Developer & Business Intelligence Developer - SQL Server 2005), MCAD, MSCD.net, SCJP 5, SCWCD 1.4, SCBCD, SCMAD, SCDJWS, SCJA