1. after every one and a half hours of studying write down what you have accomplished, that way at the end of the day you can read what you have accomplished and feel good about yourself.
2. at meal times don't just eat and think about what to study next, forget all that stress and try to enjoy this time by watching t.v. while eating to take your mind of studying. you can even use the computer, but don't overuse it. that way you'll waste a lot of your time.
3. at night read a book if reading is your hobby, play video games, or even watch a new movie. however, you've got to keep in mind that you can't stay up too long, because if you're really planning on studying you've got to get a good night's sleep.
4. if any of you are bloggers like me, then i recommend that instead of doing num.3 write something new in your blog or look at other blogs since that's one of your hobbies.
i hope that i helped! good luck :)