Ever tried? Ever failed? No matter. Try again. Fail again. But try to succeed 85 per cent of the time.

Scientists have discovered that there is a perfect amount of failure, suggesting that those who get the answers wrong 15 per cent of the time while studying have found the optimum difficulty level to stimulate fast learning.

Researchers said that a success rate of 85 per cent, or getting about six of every seven questions or challenges right, was the “sweet spot” for fast learning, explaining that anything above this is too easy and anything below is too difficult.

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