My best wasn't good enough!

I've been studying for almost five consecutive days, tried to understand and inject all the concepts on my head. Still my best shot was not good enough. When I received the test paper, I was really surprised on the problems. All were real hardcore. I applied all my learning and tried so hard finding possible solutions. My brain got damped like a PC experiencing blue screen. What a day! I can't undo my mistakes. Better  move on and be optimistic. Learning from every single mistake. I can do this! Cheer up! God's with me!