I hardly ever study. I tend to remember a lot of the things during school lessons, so studying is an optional choice for me. I also do very good on my assignments, and I am a straight A student.
So, basically, a lot of things may distract you from studying. Such as your computer, TV, games, socializing shit, etc. Try keeping those away from your study area and have your mind set how studying will help you with your future.
Then again, I stated that I hardly study, so my advice may not be helpful. Worth a shot though.