The Worst Witch (1998 TV series)
The Worst Witch is a British-Canadian ITV television series about a group of young witches at a school for magic. The series stars Georgina Sherrington and Felicity Jones, and is based on "The Worst Witch" books by Jill Murphy (published from 1974 onwards). It aired for a total of 40 episodes spread over three series between 1998 and 2001, before being followed by "Weirdsister College." Most episodes revolved around the school, following the adventures of Mildred and her friends. The series was later followed by "The New Worst Witch", which ran for two series and chronicled the experiences of Mildred's younger cousin Hettie as she attended the school.
Witch World
Witch World is a speculative fiction project of American writer Andre Norton, inaugurated by her 1963 novel "Witch World" and continuing more than four decades. Beginning in the mid-1980s, when she was about 75 years old, Norton recruited other writers to the project, and some books were published only after her death in 2005. The Witch World setting is one planet in a parallel universe where magic long ago superseded science; early in the fictional history it is performed exclusively by women. The series began as a hybrid of science fiction and sword and sorcery but for the most part it combines the latter with high fantasy. 
Witch World begins with what is now called the Estcarp cycle. These describe the adventures of Simon Tregarth from Earth, his witch wife Jaelithe, and their three children Kyllan, Kemoc and Kaththea.