„Countries with excellent education systems tend to have highly selective professions: a small fraction of those who desire to become teachers have the capacity to do so. At the University of Helsinki in Finland, only one out of every twelve students who applies to enter the teacher program is granted entrance (about 8 percent). In Singapore, only one of eight applicants to teacher education programs is admitted.“
World Bank Group (Hrsg.), Successful Teachers, Successful Students (2019), S. 26.