My friend’s teen daughter, Belen, had a big upcoming exam this past semester. Starting a week before the exam, she studied incessantly. Every possible available moment. The night before the exam, she hardly slept—she was too nervous, tossing and turning in bed, going through in her mind all the facts that she needed to know, and worrying that she missed something important. When she finally went in to take the test, she was practically paralyzed with fear, and was barely able to think clearly.