Volume, quality, clarity and neatness pay off. Reread directions before turning in an exam. Use the entire period remaining to double check. Answers quite often pop up in other questions. Keep that thought in mind.
First impressions are often best.
If an answer comes to you from out of the blue, it's probably your right brain at work. Don't fight this intuition unless you're sure it's wrong. When a question is difficult to visualize, draw it. Then work backwards to see if you're right. Sit in the front of the class.