Prepare for assignments ahead of time. If you have a 10-page literary analysis that is due two weeks from the day the professor assigned it to you, start gathering your research materials during the first week so you can write, organize, proofread and type your paper by the second week. Set aside time each day to work on the project.
Hang out with friends and family. Call some of your friends and invite them to the movies with you, or go out to a nice restaurant with your siblings or cousins. This helps you relax and you will be refreshed when you return to class the next day.
Talk to a campus counselor about the stress. Visit the university's student support center and discuss specific things about graduate school that are causing the most stress, such as fear of not getting the best grades or a disagreement with your professor. The counselor can offer strategies on how to handle certain situations.
Talk to your professor. Maybe you misunderstood what certain assignment guidelines were or you need to know more clearly what the overall expectations are from the professor for the course. Once this is cleared up, you can proceed to improving in class.
Find new hobbies. Join an exercise group in your area, start writing about your stress in a journal, or prepare different types of cuisine at home such as Indian or Chinese. This allows you to have some time to yourself apart from your studies and it makes your schedule less mundane.