Upon completion of a nine-year program the student has a choice of either completing the remaining two years at normal school, or of a transfer to a specialized professional training school. Historically, those were divided into low-prestige PTUs and better-regarded technicums and medical (nurse level) schools; in the 2000s, many such institutions, if operational, have been renamed as "colleges". They provide students with a vocational skill qualification and a high school certificate equivalent to 11-year education in a normal school; the programme, due to its work training component, extends over 3 years. In 2007–08 there were 2,800 such institutions with 2,280,000 students. Russian vocational schools, like the Tech Prep schools in the USA, fall out of ISCED classification, thus the enrollment number reported by UNESCO is lower, 1.41 million; the difference is attributed to senior classes of technicums that exceed secondary education standard.