Interesting fact: on, say, a multiple-choice test, you are likely to do better by guessing at questions you don’t know the answer to rather than systematically picking an option. The reason is that if you pick an option systematically (say, always yes to yes/no questions or using the pattern A -> B -> C -> A for a regular multiple choice test), you basically hit random chance and would get 50% correct on the yes/no questions or 33% on the A/B/C multiple choice one. On the other hand, if you guess you might tap into subconscious knowledge and do better than random chance.