Summarize this article in one sentence.
When you panic, you make mistakes, so keep calm throughout. If you successfully planned your revision, you will have no need to panic when the exam comes. Take a deep breath, tell yourself "I can do this," and calm down . Some people need music in order to help them study, but try not to give your brain anything else to focus on while you're studying. One more distraction, even if it's calming music, is another thing your brain has to process in addition to the information you're trying to learn. We all catch ourselves going off-topic from time to time. Sometimes it's because the information we're supposed to learn is boring; sometimes it's because the information we don't need to know is exciting. Whatever it is, wait until after you've studied to really dig deeper and explore different subjects. Always ask yourself: How likely is it that this information will show up on my test? If you're really focused, you can rank the information from the most likely to the least likely, giving the most likely material the majority of your time and the least likely the rest of it. Studying for a test can be daunting, especially in the beginning. Take things in manageable chunks and don't worry about getting things perfect the first time around. Remember, you're here to learn, not necessarily ace a test. Try to understand the "big picture" if you're having trouble understanding the concept. This should make the details easier to understand.

Summary:
Don't panic! Don't listen to music unless it helps you study. Don't stray off-topic. Don't get discouraged.