The Worst Witch Complete Adventures Collection 8 Books Box Set By Jill Murphy:

The Worst Witch:
Mildred Hubble is a trainee at Miss Cackle's Academy for Witches, but she's making an awful mess of it.She keeps getting her spells wrong and crashing her broomstick.

The Worst Witch Strikes Again:
Mildred is back in trouble thanks to the new girl, Enid Nightshade, who isn't as well behaved as she appears.

A Bad Spell for the Worst Witch:
After a disastrous first year, Mildred is determined to lose her embarring reputation as the worst witch Miss Cackle's Academy has ever seen.

The Worst Witch All at Sea:
Mildred Hubble, the worst witch at Miss Cackle's Academy for Witches, can't bear to leave behind her beloved cat, Tabby, when the class goes for a week beside the seaside.

The Worst Witch Saves the Day:
Something is up at Miss Cackle's Academy for Witches: Mildred Hubble's new form teacher is really weird. Or is she?

The Worst Witch to the Rescue:
Mildred Hubble always tries her best, but her spells never seem to go right. She may be the worst witch at Miss Cackle's Academy for Witches, but she's the best friend you could ever have.

The Worst Witch and the Wishing Star:
Mildred Hubble may be the clumsiest witch at Miss Cackle's Academy, but as a senior student she's been assigned the important task of lighting lanterns and candelabras each evening.

First Prize for the Worst Witch:
Summer term has started at Miss Cackle's Academy, and somehow the disaster-prone Mildred has made it to Year Four.