Karen Kjær, educated as both a school manager and a teacher, became head of the school in 1892. She moved the school to Fælledvej street, splitting the students into single-year classes. The student population grew to 324 in 1904 (from 66 in 1882) reaching a total of 480 in 1918, the school's centennial year. Because of the continued increase in the student body, Karen Kjær moved the school to an independent building in the Gartnergade neighborhood in 1897. In Gartnergade, the school continued to expand. In 1904 room was created for the new subjects, physics and chemistry. When modern foreign language courses were introduced in Denmark in 1909 (as opposed to classical), the school's management decided to create a high school, completed in 1913. The science-mathematical course was an option at the school from 1915. Although overcrowded, the school stayed at the same location until 1971. The 20th century Nørre Gymnasium through 1940 In 1919 the school changed its name to Nørre Gymnasium and, for financial reasons, was split into two parts. One part became a public high school with Karen Kjær as principal and the other a private preparatory school with Dorothea Krag as manager. Both schools were housed in the same building until 1924, when the prep school moved to Thorvaldsen's Girls’ School. By the time Karen Kjær died, Nørre had developed into a high school (including a secondary school) from its humble beginnings as a school for young girls. It had also been led by only three women in its 105-year history. Knud Theodor Thejll, former head of K. Thejll's Higher Girls’ School, became principal in 1923 and continued leading in Kjær's style. Thejll was concerned about the lack of space and other problems with the school's layout and sought a solution in 1932. It was also during Thejll's tenure that Nørre high school students started going on seven-day study trips, usually within Denmark, sometimes going into Sweden. The first trip to Berlin took place in 1970. Thejll left the post in 1940 and died a year later. Problems at the school Ingeborg Hasselriis was the school's principal from 1940 to 1960. During the Occupation of Denmark by Nazi Germany, the school came under threat of being converted into a hospital for Nazi troops. The lack of space continued to be a problem in 1940. In one case, a closet was being used as classroom: Dark, and