Sunny-
Welcome to the JavaRanch! I'm sure you'll become quite addicted pretty soon... Check out our
SCPJ FAQ (you'll find a link on the main page of the Programmer's Certification forum). It will probably answer most of your initial questions.
Also -- check out
the Bunkhouse where we've reviewed lots of
Java books (and a bunch about certification too) my favorite SCPJ book that I've read is the one by Kathy Sierra and Bert Bates.
So, good luck with your studying -- if you have any questions, be sure to check the archives in this forum (there's TONS of information in there), and if you can't find what ya need, feel free to ask here anytime ya like!