Maybe you could try drinking some herbal tea before school. Its good for calming nerves. If you only have 3 days left you'll have to decide if a grade penalty is worth leaving early. (that would depend on how severe the penalty is & what it will mean for the next school year)
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Balance is needed within the universe, can be demonstrated in most/all concepts/things. Black/White, Good/Evil, etc.
All dependent upon your own perspective in your own form of existence, so trust your own gut and live the way YOU want/need to.