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What is the relationship between stress and IQ?

When a person is calm, they do better on tests. This can explain why drugs are so popular with kids. Medicines that calm your mind down to help you focus— which improves your IQ— can result into a better score. You can accomplish the same with caffeine, where just the right amount can get you calm and focused, but take too much and you will get jittery and unable to concentrate.

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