The books that comprise this series are written for primary school children. Each volume focuses upon a particular children's author and profiles that author's life in a way that younger readers can relate to.
This is a short and sweet introduction biography on the life of JK Rowling. Definitely aimed at younger children so I wouldn't exactly recommend it, due to its simplicity. Also it was written around 2003 and its about 14 years out of date. Honestly, I just want her to either write a biography or publish a book of her tweets.