RAZ, the full name of reading A-Z, is an internationally renowned graded reading system, with 27 levels from AA to Z, each level contains dozens of books, and the whole system exceeds 1000 books.

RAZ is designed according to the cognitive ability, reading ability and interest of children of different ages in content, helping children to gradually advance from primary, intermediate to advanced, and improve their reading ability from easy to difficult.

In RAZ's AA and A grades, words and phrases are the main ones. Sentences and essays began to appear at B and C levels, and long stories began to appear at D levels and above.