[JohnPlace]

First, a few obvious suggestions that you probably don't need me to tell you: Get plenty of sleep. Go to bed at around the same time every night. Exercise for at least one half hour every other day. Eat right.

The biggest dietary mistake my students make is skipping breakfast. My wife, a Dietetic Technician, is always telling me how important breakfast is. She's right. Do not skip breakfast. A bowl of oatmeal and some yogurt is a nice way to start the day.

Eating healthy and getting enough sleep is half the battle. One more point: If you have healthy eating habits, you should not need to "constantly snack on high energy foods." Instead, work healthy snacks into your regular routine.

Now, for a few less obvious suggestions:

1) Crackers and cheese is a fantastic study snack because it replaces your glycogen reserves without causing a high or crash.
2) If you find your obligations exceed your capacities, you may need to prioritize. Sometimes this means focusing on high impact assignments and using the 80/20 rule on lower impact assignments.
3) Know where your points are coming from in each class and prioritize your time accordingly.

I hope this helps. Best wishes to you, and good luck with your classes.