I failed my math test. What should I do?

Read updates below:

Added (1). My teacher upgraded our grades online today, and I saw that I got a 72% C- on a 50-point math test. My overall grade is now an 88.8% B+. I want to get straight A's this quarter, and I still have an upcoming final this Wednesday. I really hope to do well on that and raise my grade up.

Added (2). How should I tell my mom? She recently got me an iPhone 6 Plus and said that she would take it away if I got bad grades. I really want to keep my phone and am scared to tell her. She'll most likely find out about it later, because there's an app where she checks my grades everyday on.

Not sure, but let me say, your parents go easier if you tell them instead of them finding out themselves.

So you didn't fail. You got a C, which is universally understood to mean average.
B+ is not failing either. B is universally understood to mean above average. Getting straight A's isn't important in the grand scheme of things.

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