See this. Goto is a keyword; null, true and false are literals. You should expect questions on the exam which use a keyword as an identifier while the question seems to be about method overloading i.e. sometimes the questions trick you into focusing on something else and actually there's a problem somewhere else...
If you see the keywords list, the keywords are not very tough to remember. In fact I think you'll not need to remember them, they are used in daily programming so we remember them without any special efforts. You might get a question that uses an identifier like goto or const (which are unused keyword so people don't remember them). The SCJP exam is very tricky, so the best way to get high score is to give a LOT of mock exams. That way you'll know almost all of the traps that the exam might try to catch you into. (I'm sure you noticed the keywords try and catch in my last sentence )