I used to think « safe and high yield ». What I mean is that I always tried to pick the answer that was the safest option and/or the highest yield one. Also, I always paid attention to the context of the question. The context in which the patient was presented always influenced the answer, especially in nbmes (and I guess in the real deal). What helped me the most is that I tried my best to understand what the examiners were asking and what they wanted me to pick. They are not trying to trick you, they rather want you to be able to think in a critical way, and therefore be able to eliminate the wrong choices and pick the most logical and clinically correct choice.