Stressfulness is definitely the last thing you want to encounter in your study.
So Relax.
Bear in mind that DSE is no big deal. Even you do not perform well, there is always another way to achieve high.
There is no reason to be afraid of something that is not that important. So CALM DOWN.
Keep that in mind, recompose yourself, then study.
I know you can do it. ADD OIL. Look forward to receiving your good news