If question 28 is known to be B, avoid guessing B in 27 or 29. Avoid answers with absolutes when you are guessing. Selecting one of the longer multiple choice answers is slightly better than a random guess. If two out of four choices are almost identical , guess the longer of the two. If two answers are similar except for one key word, it is slightly more likely that one of them is correct.
Teachers tend to include more true than false answers on true-false style tests.
When guessing look for familiar words in the answer. Becoming a Master Student . Ellis, E., Teaching Strategy Sameness Using Integrated Formats. The Learning for College Success Guide. Mohawk College, July 1993.