In reading order
Naughtiest Girl in the School
Enid Blyton
The Naughtiest Girl: Naughtiest Girl Again
Enid Blyton
The Naughtiest Girl: Naughtiest Girl Is A Monitor
Enid Blyton
The Naughtiest Girl: Here's The Naughtiest Girl
Enid Blyton
The Naughtiest Girl: Naughtiest Girl Keeps A Secret
Anne Digby
The Naughtiest Girl: Naughtiest Girl Keeps a Secret & Naughtiest Girl Helps a Friend
Enid Blyton, Anne Digby
The Naughtiest Girl: Naughtiest Girl Helps A Friend
Anne Digby
The Naughtiest Girl: Naughtiest Girl Saves The Day
Anne Digby
The Naughtiest Girl: Well Done, The Naughtiest Girl
Anne Digby
The Naughtiest Girl: Naughtiest Girl Wants To Win
Anne Digby
The Naughtiest Girl: Naughtiest Girl Marches On
Enid Blyton, Anne Digby