The Worst Witch

Before Harry Potter became the character everyone thought of for magical school drama, there was The Worst Witch!

The Worst Witch is a British television series about a group of young witches at a Magic Academy and is based on The Worst Witch books by Jill Murphy.
Mildred Hubble is the worst student at Miss Cackle's Academy for Witches. She is well-meaning but does things without thinking. The benevolent headmistress, Miss Cackle, is generally understanding, whereas Mildred's form teacher Miss Hardbroom thinks she just isn't trying hard enough.