It is not a good idea to do the most difficult section first. Often, a student following this method will not leave enough time for questions that would have been sure points. Leaving essay and sentence completion questions for last can often be beneficial because you find answers among the already completed objective questions. However, if essays are left for last, be sure to leave enough time to outline your thoughts, and then write the answer clearly. Keep a steady pace and do not let more difficult questions affect your attitude and steal your valuable time.
Students often cloud their minds by lingering over difficult questions.
Moving on and finding success with other questions is a better method. If you are not penalized for wrong answers, guess and move on. Rely on your knowledge and don't watch for patterns. One cannot be sure that the teacher varied the answers. It is better to trust knowledge to help you answer the questions.