Originally posted by: PokerGuy
Even if you don't know the answer, you can usually rule out one or more of the other answers, so you can really improve your odds when you guess. If you are penalized for guessing, don't. Otherwise, try to narrow it down and then guess.
This, and:
Originally posted by: George P Burdell
Even without studying, most multiple choice questions can be narrowed down to two choices. After that, flip a coin. 50% chance of getting it right, which is much higher than marking "C" for every question.
If you can't narrow down to two choices, you have other problems.
Depending on the sophistication of the exam creator, they MIGHT also use this technique. One of the potential answers is the "distracter" that looks so good it will draw the attention of people who do not know the real right answer. It helps to distinguish the ones who know from the ones who guess. A local instructor might not do this, but on nation-wide exams made by experts they might. If you think that is what your test is doing, use that when you guess. After eliminating the obvious bad choices, the yummiest-looking one left over MAY be wrong!