Call your local rink and ask for a figure skating coach who teaches hockey players. Go consistently. 1 week clinic isn't going to fix anything.
Take a look at your players quad, core and glute strength then ask yourself if he is efficient (achieving maximum productivity with minimum wasted effort or expense). Secondly, analyze his stride by looking at his stride width (you can find info on this easily). Third, take a look at his arm swing and adjustment to stride during his start to maximum speed.
Fourth, dont waste your money on a in season clinic with a player his age. Fifth, take a page out of Sweden youth hockey and spend time and money on making him a well-rounded athlete.