I don't know what to say, but it's just unfair... I'm not meant to complain, but I can't help...

I don't know whether you have had the same problem as me, but I would like you to know my problem... well, you may not like to hear about it:

I am a high school student, more specificly a freshman, who need to get a good grade under the pressure of competition of society. I can't say that I am doing my best, but what I have done is enough to get straight A's. Today, however, I got a phone call from school which has said that I got a F in my P.E. class!!!! I was shock when I got that call, not because I didn't do good in my P.E class, but they gumed up my grade! I can definitely tell that I get a very high point in my P.E class. Every test that I took in P.E class, whether mile running or sport competition, is A or above. I am upset and mourned. I have done everything with exertion, but the things all end up with melancholy.  I have even thought a question- should I just play games every day, which means to enjoy my life, instead to doing work hardly? Others told me a american slang- "easy come, easy go," but I wasn't doing my work headlessly, why have I end up the same?

Anyways, if you are still looking , I appreciate that.

Thanks to your reply.

Well, it is my fault that I didn't tell in the paragraphy that this kind of matter have happened many times. It can simply ruin my file of highschool...

I agree with IF.

If it happened once, it sounds like an entry error. If it happened more than once, then there is something going on that you are missing. You absolutely MUST talk to your PE teacher and not assume they made a mistake with your grade. If it was a mistake, they will fix it. If it was not a mistake, then you need to be aware of what you need to do to fix it for future marking periods. But to sit there and say "They made a mistake; I'm perfect. But I'm not going to do anything about it" is the wrong course of action!