some simulator exams contain questions that are beyond what is there in the PMBOK guide and the common available resources (Headfirst, Rita, prepcast,...). based on my experience and other colleagues, it is very unlikely to face such questions in the real exam. so my advise is, if you face such questions take a note about it but don't give it more attention than it should and more importantly don't let such questions frustrate you or affect your self-confidence.