I'm mad

I don't know how to describe my mood now. Autually I'm not in mood talking about. I really value about the grades of all classes. I know I'm not a perfect person,but I do want to do the best I can. The biology test today made me crazy. I thought I had have already prepared for the test,but when I did the test everything mixed up. Almost all meaning of biology words I didn't know. Everything words looked like same. Biology is not the most difficult course and actually it's very interesting. But I don't know how to say, I'm still struggling with my language problem...I feel so bad today.