Look over your equipment, most of todays bows can take a dry fire, well maybe not a Mathews . Seriously, look it over or take it to your local dealer to check it out. I've seen Hoyts dryfired many times and it only breaks them in. I wouldn't personally dry fire any bow regardless of manufacturer but most come out of it clean.

Is it necessary to draw your bow during class room activities? If not, throw a tie wrap on the cable and string so it can't be drawn, or at least when it's out of your sight.

Good luck with your Mathews.