What the hell! I received the terrible score on Survey of Calculus.

Oh my god! yesterday I received the mail from the professor of Survey of Calculus. When I clicked the mail and read the contents, I was embarrassed and was surprised by the very bad score. Whenever I always took the test of the subject, I always tried to do best. It was because I orginally was not good at mathemathics. For this reason, I prepared this test hardly as the former tests. Nonetheless, the result was very terrible. At that time, my mother rang up for me. When she said " How was it going and have you studied hard?", I felt sorry in internal mind. I cannot say I received the bad score to her. Now, I am thinking about the mistake of the professor. In the last test, he took the mistake about the test grade of one student. He did not check the last page, so he proofread the score. For this reason, I hope he took the mistake about the score for me.