Technologies Objectives

Hello,

I recently decided to begin studying for the SCJA/OCAJ exam. I just finished reading Head First Java and I think I have a fairly decent understanding of the language, syntax, OO stuff. The stuff I am a little fuzzy on is the Technologies objectives (Section 6 - 8). Can anyone suggest some places where I can read up on these items?

I am planning to purchase the mock exam questions, but am on the fence on whether I should purchase a whole other book just for those sections. Any help/suggestions are much appreciated.

Thanks,
Whit