The Twins at St. Clare's (1991)

The series is an adaptation of the "St. Clare's" novel series (1941-1944) by Enid Blyton. The setting is an English girls' boarding school. The twin sisters Patricia "Pat" and Isabel O'Sullivan are send there against their will, as they actually wanted to attend a more expensive school with their former classmates. They are initially perceived as snobs by their new classmates, who mostly dislike and avoid them. However they soon bond with a few other girls, and gain an appreciation for some of their teachers.