Context: I have a big exam, I have been studying like crazy. I hope I do well, I need to good on this exam.
Speaker 1: I have a big exam for college coming up, I have been studying day and night.
Speaker 2: What's the exam on?
Speaker 1: It is for my molecular biology class, I feel pretty good that I am going to Ace it. 
Speaker 2: I wish you good luck!