Panic Attack

My English Comp exam is in 20 minutes and I'm pretty much freaking out. I told myself I wasn't going to worry or stress out, but it's not working. I pretty much am almost positive that I'm going to fail. The fact that I don't know how to sentance diagram, mixed with the fact that I barely studied is starting to worry me.
Oh puke.
And then I have my New Testament World exam at 1:00.
I hate exams with a passion.