When you black out during exam time

For one particular problem in intermediate micro, I have studied all night and all day long.

Exam time. I see the question. Exactly like I have practiced. I thought I had it. But no, I realized I skipped a step and messed up all the answers. 10 minutes left. I'm in panic. I try to fix everything, but my head isn't thinking right. I turn it in, done my best. I walk out from the door, not knowing exactly what went wrong. I knew it still wasn't the right answer, actually way off than what it should be. But...I just didn't know.

As I am walking towards my work, I realized what I have been doing wrong the whole time. Too late. Exam is already submitted to be graded. I feel absolutely stupid. Yep, I blacked out. It happens to me sometimes, but I never expected to be it today. Looks like no A for me in intermediate mirco. Wait, I still have final to study for. I'm just gonna have to study harder.

I'm disappointed...and upset...and tired. I still have an evening rehearsal to go. I'm really not in the mood anymore. I just feel...stupid now. I can't believe I made that mistake.