How do you manage stress?

During the last week of the year, I am turning things in and doing finals and working on things that I did badly on. Eventually, I get so caught up in the work that I get stressed about everything, even though I have plenty of time to get everything done. It is also stressful to know that I cannot mess up on these exams since they are really important for my grade and that I might barely be passing in a few classes. To combat this, every few hours, I will watch a few videos on youtube so that I can have a few quick laughs and then go back to work. I can also play some video games to try to think of something else. These are things that I do to get rid of stress and it works surprisingly well.