The day you have been preparing for is here and there is nothing more important than being in the best of your mental and physical state. Strengthen your resolve, remind yourself of the reasons you started the preparation and what all sacrifices you have made.
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Do not doubt yourself, because a lot of it comes down to the day and how you keep your calm. Remember that every difficult question is difficult for everyone and it should not affect your performance in the rest of the questions. Believe in your capabilities and cast aside all doubts. Tell yourself that when the time comes you will remember everything you need.