First, go to the excerpt you had to read. If this is a multiple choice question choose the word you think is best, by your gut instinct, or what the excerpt shows to be correct. If the question isn't multiple choice then you need to closely read the text. Look for unreliable points in the excerpt and choose an unreliable word you think might be the answer. If you never read any excerpt, ask your teacher for help.
P.S. Without any excerpt in your question, I can't base my answer off of much. I tried to help you the best I could.
