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Beta blockers such as propanolol have been "prescribed" to overcome performance anxiety or stage fright. It affects the response of the brain so that it will supposedly help you stay calm and not be nervous about a forthcoming event, which in your case is driving.
It is best to try and take it beforehand to check its effect on your body. You can also check on how fast it acts on your body. You wouldn't want to go on your driving exam looking drugged, right?
Hope this helps.
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