Just breathe. At this point the test is over so just concentrate on doing the rest of your work and preparing for the next test. Also, talking to your prof or teacher about what they specifically want you to know is a good idea.
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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.