How to pronounce “upper school” in English

He was also a wunderkind of advanced placement classes, a star debater, and a fledgling songwriter whose extra-credit homage to Madonna, for Math Appreciation Week--"Like a Cosine, Solved for the Very First Time"-- had, unfortunately, been broadcast to the entire upper school.Despite playing on the varsity soccer and baseball teams since 10th grade-- granted, his was a Jewish day school-- Nate never quite achieved the reputation of an athlete.