The Worst Witch Series
What the series is about, according to Amazon: "Magic is on the timetable at a school for witches. Laughs, spells, disasters: a bewitching brew. Mildred Hubble is the worst student ever to darken the doors of Miss Cackle's Academy for Witches. Every spell she attempts goes horribly wrong. And things get worse when she accidentally turns Ethel, the teacher's pet, into her deadly enemy."
Number of books in the series: 7
Ages the series is best suited to: 8-12
Buy the books here: The Worst Witch Series ($27)