Has anyone else felt completely overwhelmed trying to keep up with everything?

This semester has been one challenge after another. I am working part time, helping my family, and trying to stay on top of my classes, but lately it feels like there just are not enough hours in the day. I have an online exam coming up and every time I sit down to study I end up worrying about how much material I still need to cover. Last night I was so exhausted that I caught myself wishing someone could take my online exam for me because I just wanted a break from all the pressure. I know that thought came from stress, but it made me realize how burned out I have become. Has anyone else ever felt like this before a big test?