LISTEN TO ME DUDE
Boxing doesn't mean shit unless you plan on boxing him. Take him to the ground and all of his training isn't worth a shit. I am take MMA classes and that's one of the first thing's they teach you:
Find what you are better at than your opponent.
I would suggest taking some wrestling classes at school or if you wanna be real hard go practice jiu jitsu.
Like that other guy said, one clean ass elbow the face will cut him wide open, so once you got him on the ground keep your hips and chest heavy on his and throw bows son. xD