In continuation of the witches theme, here is another book: 'The Worst Witch' by Jill Murphy.
It is the story of a girl who is a slow learner in the academy of witches. Tumbling, breaking her broomstick, turning her enemy into a pig and many other things keep us laughing. In the end she proves to be a brave witch by saving the academy from the bad witches.
The pictures in the book add more fun to the story.