Sometime, there are surprise questions in the tests. Or a familiar question is framed in an entirely different way. Or you just did not take this one down. How do you tackle it? Maake a guess that is not far-fecthed. Surely, your teacher will not ask anything beyond the scope of your lessons. Run through the abstracts of all your lessons and determine where this strange questions falls. Connect and answer as relevantly as possible. If it is inaccurate, your teacher will still see that your answer is reasonable and credit you for it.