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If your exam is early, then the process will help wake you up. Also, it will make you feel more professional and alert while working on your test. Keep in mind that you don't want to be uncomfortable. Layer, so that you won't be distracted by an overly warm or cold room. Try to prepare what you will wear the night before. If you pick out your outfit ahead of time, you will have more time in the morning to focus on eating a good breakfast and running through your notes again. You want to save all of your brain work for reviewing for the test the morning of, not deciding what to wear. Cramming into the wee hours, then trying to be sharp for the test is a really bad idea. It is important to be well rested when you take a test. Lack of sleep can seriously affect your brain function in areas of memory, perception, and the level of cognitive capacity at which you can function. So getting a good night's sleep the night before a test is crucial. Your brain functions better when it has all the nutrients it needs. Eat a good breakfast (or lunch, depending on when your test is) before you take the test. This will help you perform at your best while taking the test. There are also certain foods that are thought to be good "brain food" to take before a test like bananas, peppermint, and other superfoods. Bring everything you need: pens, pencils, erasers, calculator, etc. Don't expect others to provide these items for you. Your teacher and your classmates may not have extras all the time and you don't want to be forced to take a test without an item you need. Pack your backpack the night before so that you know you'll have all of the items you need. You don't want to rush around in the morning and accidentally forget something crucial. If you don't have assigned seating, come early to class so you can pick a great seat. You want to be away from windows, heaters, and away from any other distractions like a noisy hallway or another student you know will be distracting with their behavior. When you get there early, you get to choose your spot.
Dress up before a test. Get a good night's sleep. Eat a healthy meal beforehand. Come fully prepared to take the test. Arrive early to choose the best seat for you.