hi Yasser,
the
scjp 6 version has added the following topics :
usage of io.Console class
addition of NavigableSet interface
addition of Navigable Map interface
you can look up on the Sun's official website for the official objectives for scjp 6..
as far as the book goes prepare from the scjp5 K & B book itself....nothing much has changed....for the additional topics you can look around on the internet....there are plenty of resources available.....
best of luck!!!