Jokes aside, the Sun tutorials and white papers available from
http://java.sun.com/ are helpful.  Read /Effective Java/ by Joshua Bloch.
It's not specifically for the exam, but it'll help.

Thank you everybody for your feedback. Java Ranch is an awesome
website as it has pretty much all the resources I was seeking.

As for coding, I think  Manivannan is right. Although I can code basic
things in Java but I'm not comfortable enough yet to write my exam or
take up on a big project in Java.

...

(Studs?  Steads?  Standards?  I am guessing you meant
standards, but that word does not quite seem to fit, and if
it was completely spelt - I would not have to guess.)

...hmmm.  Well, to that I would add the qualification that
you should only be paying attention to the aspects of the
code that Sun claims to be explaining in that example.

Otherwise, there are many questionable aspects to most
of the Sun example codes, including using methods that
have been deprecated for a long time (e.g. 'widget.show()')
and a general lack of applying advice that Sun itself issues
(such as using SwingUtilities.invokeLater() for Swing GUI's).

Other people might be able to highlight other questionable
practises in the example codes, but those are the two that
are most obvious to me.