Many students believe that studying late into the night is the best way to prepare for an exam. Scientists have found the opposite. During sleep the brain organizes what we learned during the day and stores it as memory. Rested students are alert in class and can concentrate for longer. They also make fewer mistakes when they solve problems. A good night's sleep is not a luxury but a tool. Most teenagers need between eight and ten hours each night.

Answer and explanation

Correct answer: C. How enough sleep helps students think and remember

  1. Step 1: The passage explains that sleep helps memory and attention. Step 2. The best title reflects this. Answer: How enough sleep helps students think and remember. Why not the others: the others are unrelated or the opposite.

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