This great selection of books graded to different levels of English is at least as good as our first recommendation was. Books are not only graded, they are categorized by age groups, as well.

• books for kids aged 6 to 12 are graded to 6 levels;
• books for students aged 12 years and up are graded to 7 levels;
• and there are further aspects of categorization, based on interests and types of books.

And, very practically, there are placement tests for you to find out your level.

The magic search word is PEARSON,

and the invaluable link is:

https://readers.english.com/choose-readers