Figure out what are the biggest causes of stress in your life. Is it your job, your commute, your schoolwork? If you’re able to identify what they are, see if you’re able to eliminate them from your life, or at least reduce them.
If you can’t identify the main causes of your stress, try keeping a stress journal. Make note of when you become most anxious and see if you can determine a pattern, then find ways to remove or lessen those triggers.