im 16, young and wild- more like im 16- emotional and confused. i honestely feel so bad right now. I

im 16, young and wild- more like im 16- emotional and confused.
i honestely feel so bad right now. I have one of the most important upcoming exams in a month and i still havent started getting ready properly, even tho i have planty of time. All i want to do is sleep, do nothing and just lay in scilence until its too much and i start crying.
What is happening?