I have heard something similar about a grammar school in Germany. Every 2nd year a student killed himself and also drug abuse and other things like that are more commonplace there compared to other types of schools in the city.
It seems that many similar institutions cannot cope with the development of young people and then the pressure rises until some of them see no other choice but to end this or try to escape.
Also mental health problems seem to increase in young people.
Somehow I think they should get more attention from really skilled people with social skills and also the education system(s) need to change to allow them to grow up before putting too much pressure on them.