nope, Sun doesn't release that kind of information. Definitely expect 2 or 3 questions from each section, but everyones
test is a bit different, some get more questions on threads than garbage collection, others get the most on inner classes.
There's no hard and fast rules, just make sure you've got a good handle on everything.
Also -- you can do a search in this forum for this topic -- you might find insight from others as well.