I heard (and it was confirmed by my teacher), that there is a method to answer multiple choice questions (not free-response), without even looking at the question. you just looked at the answers and got your answer.He said he had a student who did nothing in his class but ended with a 3 or 4 on exam because he knew this strategy.
Don't say the strategy doesn't exist, it does. even posted in other websites.
P.S.I don't know though if this was for every ap exam or just physics (my guess it works for others to but in different manner (way)