Once Sarah Mae Lagasca picked herself up off the floor of Newark’s Arts High School gymnasium on Friday, she addressed her students, who were giving her a standing ovation and screaming so loud she worried they would ruin their vocal cords. “This is cuckoo bananas,” Lagasca, a music teacher, said to the crowd, after the surprise announcement that she had received a $25,000 Milken Educator Award, considered the Oscar of teaching. The Milken Family Foundation, which supports education around the world, recognized Lagasca, for her Contemporary Voice and Recorded Vocal Music program, in which stud…