If you are going for your Sun Certified Java Programmers exam, forget about J2EE. Those are the enterprise APIs built off of the back of the base Java programming language. The SCJP exam covers strictly Java language fundamentals. The later certification exams go into the details of J2EE in more depth. Get one of the good Programmer Certification Guides, advertised here on the Ranch and you shouldn't have any problems after a bit of time and effort invested in studying the material and practicing the exam using a few mock tests.
There's a way to do it better - find it. -Edison. A better tiny ad: