High school junior, completed CM level 10 and been playing for 11 years, tutoring and coaching experience with kids, can teach classical, pop, how to play by ear, music theory, etc

I signed up for a few lessons to try him out… Worst decision I ever made. He lives near my school (Rancho Bernardo) so it was an easy commute. The first lesson was alright, but all downhill from there. When I would make a mistake he would gradually get more angry and volatile, I made a lot of mistakes because i’m a beginner, he got so mad to the point he broke my finger when trying to correct me. Safe to say i will not be getting lessons anytime soon and especially not for Professor Jang.