I failed my junior research paper. What should I do now?

I felt like I did really good on it and then when I went to check my grade, both of the test grades were a 50. These brought my overall grade down to a 71. Before I had a 96. And now my GPA is a 3.0 and used to be a 3.3 or 3.4 at least. I feel so depressed right now..
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