DOWNLOAD THE BOOKR SCHOOL APPLICATION FOR FREE FROM HUNGARY'S ONLY DIGITAL TEACHING MATERIALS PROVIDER! Who do we recommend? 1. FOR GENERAL SCHOOLS BOOKR Suli was developed by Hungarian teachers of primary school grades 1-8. grade students. The application and the digital books contained in it take into account the age characteristics of the children, and the interactive tasks of different levels of difficulty can be easily adapted to the students' knowledge level. 2. FOR HUNGARIAN TEACHER