If you do a good job of studying, you should be able to handle a reasonable test. Do the easier questions or problems first. This approach gives you a chance to loosen up. Budget your time so that you don't spend too much time on one part at the expense of another. If you have a good reason to do so, change an answer.
Research indicates that more answers are changed from wrong to right than from right to wrong.
Answer all items, even when there is a guessing penalty. In the long run, you come out ahead. Don't read too much into a question. Be sure you know what is being asked. Always try to support your general statements with specific examples, facts, illustrations, and evidence.