Never mind all the guys with their "never studied in my life" as this thread obviously isn't for them. What it really sounds like is you're having difficulty assimilating the material. You may be studying so hard because it's hard for you to understand. Try talking to the teachers more or even looking into getting a tutor or going to study "clubs". It obviously sounds like you're interested in your education and probably on going past high school. It doesn't get any easier after so you better find out what works and what doesn't fast.