Because it is just too much information and can be very stressful and it's probably just overwhelming to try to take it all in at once.\n\nTry breaking everything down into little parts at a time.  Like if you have to study 5 or 10 chapters of a book for the finals, try to just study one chapter at a time each night.  Study good and read through it and take notes and decide to quit after the one chapter, then move on to the next when you are ready, the next day, or whatever; however much time you have allowed for you.