It's hard NOT to get stressed this time of year. Here's what I do: I take everything ONE THING at a time, and NOT worry about the rest. Put your things to do in order of most important, and take them one at a time. I've found that worrying just makes it harder to finish your work.
It's helping me A LOT this year. Tomorrow is the last day of classes, and yet I am not stressed. I have a test tomorrow in Music History III, a 7 page paper due Tuesday morning, and my saxophone jury on Wednesday. I'm just taking it one thing at a time...and it's going OK.
If you need to vent, PM me!
