have you ever complained about your grades?

For me, you should approach him personally and explain your side, don't message him on FB he will just ignore you if you did. At least if you talk to him personally there is no way that he can make any excuses to show you how you ended up that grade. Good-luck!

I think complaining about your grade to your teacher is goods that if you are really confident on yourself. At least, you can discuss your weakness with your teacher. I think if you talk nicely to your teacher, it should be alright. But if you just talk to him or message him rudely and tell him that he shouldn't grade your so low, then I think that is too rude.

The best way si to have a consultation with that particular professor and let him or her explain why your resulting grade is what you saw. Your professor should accommodate you and explain very thoroughly why it has happened. You mentioned that you tried contacting him via Face book. I don't recommend it since he might have a hard time explaining. Remember, you can't see the records for themselves. Both of you might encounter some difficulty in communicating. If you can, try to ahve his number and set up a meeting. There's nothing rude if you informed him of your feelings. As long as you asked politely (I'm presuming) and you didn't (in any way or form) threatened him, you should be able to talk the matter in a civilized fashion.

It's ok to ask about it because you work hard for it but approach your prof in a proper way don't be rude it won't do you good . Ask him how he come up with that grade. Explain to him why you think you deserve a higher grade. It's posssible that he overlooked something. Goodluck!

Oooo ,,,its all time happends when i get less mark in any subject. Actually when i give my exam that time i know how will be my exam,,,, if they result comes lower then my expectation,,, then only i complain,,,