Sit down at the beginning of each semester and realistically budget your time. Mark major class deadlines on your calendar, and work backward to set smaller goals with coinciding deadlines. This allows you to avoid the stress of competing assignments at the last minute. Also schedule social time, work time, and personal time, so that you have a healthy rhythm of labor and rest woven into your days.
Create a habit of positive self-talk. Each person has a continuous inner dialogue with himself throughout waking hours. If you constantly think, "I don't have enough time," or "I am going to fail this course," your thoughts will directly effect your stress level, sending it through the roof. Isolate a few of your negative thoughts, and proactively replace them with positive ones. Write down the positive thoughts, and place them in a visible location in your dorm room or house, so that you are reminded to actively engage in positive self-talk. Say the positive thoughts out loud whenever possible, to internalize them on a deeper level.
Set up a strong support system. Contact your parents or siblings at least once a week if you have a healthy relationship. Share your frustrations and triumphs, and ask for advice. Join a study group to take the pressure off studying for a major exam. Choose friends who build you up instead of tear you down.
Practice deep breathing, stretching or prayerful meditation for 20 minutes each day. Try to schedule this at the start of your day, so that you are grounded and centered for whatever comes later.
Do not spend more than you earn. It may be tempting to buy a round of beer after a major exam, but if it means eating Top Ramen noodles for the rest of the month, it's not worth it. Financial pressure equals major stress. Budget your funds responsibly and your overall sense of well-being will improve.