Not sure where you're from Ecstasy, but in America, most of the teachers don't know shit about what they're teaching. I was a TA at a Career training facility (Had to wait like 2 months to get into my Trade, so they made me be a TA for a math class) and they had this substitute teacher who I called out. The dude was trying to say that everything has a point when it comes to math problems. I showed EVERYONE how to solve the problems in 2 fucking steps, this douche thinks he's a genius and tries to connect these math problems with the universe. The guy was a complete dumb ass, I erased everything he had on the board right after he put it on and told everyone how to do it correctly.
Long story short, Americans are fucking stupid, I should know, I'm one of the few that were able to actually pass High School without doing homework.