i think some colleges offer degrees in recreational tourism or some such thing. i met a guide who had a degree in forestry and in the off-season worked for the national forest service and/or park service. suggest just calling a guide service and interviewing a guide.
slightly off-topic, but i'd encourage you to pursue academic excellence first and foremost for several reasons:
1. it gives you options for the rest of your life. if you break your back in a fall, having a professional career will enable you to continue bringing in an income.
2. expanding on #1 - experience in medicine can be extremely valuable and are scarce in the backcountry. ed viesturs was a veterinarian. greg mortensen (author of 3 cups of tea) was a paramedic. that knowledge can mean the difference between life and death for yourself and your clients. if you watch the 'everest' series on discovery - the base camp doctor (monica piris) is an MD who moonlights in ERs to fund her worldwide climbing adventures. sweet gig.
3. many guides live a nomadic lifestyle and eat bread sandwiches. because of the inherent risk you won't be able to afford healthc are or life insurance. the guide service likely won't provide it. getting married and having kids? - you'll likely leave them with nothing. need a root canal - there goes 2 months income. suggest reading ed viestur's autobiography. ask yourself if you're ready for years of hard living in pursuit of a dream.
4. excuse the language - but there's the "pornstar analogy", which i'm lifting from a letter published in a recent edition of 'rock & ice' asking the same question about becoming a guide. essentially - turning your passion into your occupation can eliminate the enjoyment. the editors strongly suggested keeping mountaineering a passion. it can still be a significant part of your life.
My $.02.