Where there is multiple choice, the number of correct ones
was given (if I recall correctly), however not all the
questions are of type "multiple choice".  I'm not talking
of "single-choice" as alternative, but even different
types of questions.
If you know the language, there's nothing to fear. Study,
make programs on your own, try to make use of as many as
possible  java.util.*  classes.
Good luck, anyway!
PS: If you're unsure about a question, don't waste too much
time on it. Just mark it, and deal with the other ones first.