meet a pretty big problem

that's about my terminal examination of java programming language. I got a pretty low score, that can't be lower any more. is it my true mark? I were feeling quite satisfied with that exam. so, this mark is out of my expection, though it's a selective course. I will have worse mood in serveral days. why? why? why? i can't understand why. urgently waiting for message from Mr. Hong, my teacher of this discipline.