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Coffee contains caffeine, so it can help you feel more alert and focused for a short time. However, too much caffeine can cause sleep problems, headaches, shakiness, or a fast heartbeat. For teenagers, it’s better to limit caffeine and not depend on coffee for studying. Good sleep, proper meals, and enough water are better for concentration.
Caffeine itself is not the problem, the problem arises when people start taking coffee back to back thinking they do'nt have to sleep. moreover caffeine should never be consumed before bed as it can stay in system for hours and can ruin the sleep quality resulting in tired morning despite sleeping for long