tension, please go away!

i know it's common for people to have stress and to deal with it.
but when you're in my situation, it's a bit difficult to let THEM just disappear.
i had most of my tension when dealing with exams.
and am currently having exams.
obviously, throughout the studying and revising,
i could feel my insanity level gradually rises.
even if when im sleeping,
i'd still kept thinking about the formulas and stuffs.
its so fckin annoying!!