Essay Questions: I try to keep to a minimum of content, concentrating mainly on spelling, grammar, and syntax. As long as I simply repeat what the instructor said during lecture, I'm almost guaranteed a B.
Multiple Choice: There is only one correct answer (obviously). The is also one completely wrong answer, and one or more answers that mean essentially the samer thing, could go either way, and are meant to trick you. Eliminate the obviously worong answer, and whichever answer is the least wrong of the remaining three is the correct answer. Of course, if it's a maths test, then just try each answer until you get the right one.
True/False: Go for the obvious ones first, then go back and see which answers of the ones you did not do agree in some way with the ones you did do - no answer T/F will ever contradict another T/F answer!
I hope this helps.