AMS Final

So today was my AMS final and I wasn't too stressed about it. I did ok for the whole semester and I know the material pretty well. So I wasn't making a big deal for the final. So during the final I was doing fine answering the questions without any of them making me sweat. But then my calculator died! I was up to about question #20 out of 42 and had no way to finish the test. I felt like I was going to pass out. Then I just started switching th batteries around in my calculator and it started to work. It was only for like 15 minutes but then I figured out that I have to leave it on and not keep turning it off everytime I used it. So I finished the test but really couldn't check my work over.