Move past it;
Remember it's only one grade and you need to get over it. You will feel upset or frustrated but don't keep thinking about it especially weeks later. Things happen so accept it and grow from it.
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What went wrong?;
Identify the problem and try to solve it. Ask yourself questions such as did you not study enough? Did you not do the correct study technique? Of just what actually went wrong?
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Let it motivate you;
Just because you got one bad grade doesn't mean you will get another, let the bad grade help you to do better and to give yourself some motivation to do better in the next test.
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Speak to your teacher;
Ask your teacher questions such as why you did so badly or what you could do to improve. Most teachers are willing to help you as long as you ask at the correct time.
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