The last questions on the sentence completion section require a mastery of complex vocabulary skills. The only way to do well is to know a lot of words really well. The last questions are meant to be difficult and they will be. If a test taker can eliminate two or more choices, it may be a good idea to take the gamble for the points. However, it is wise to remember that a quarter point is taken away for each wrong answer while skipped questions neither give or take away points.