Having textbooks adapted to differentiation is the first key to allow teachers to change posture and support their class in a differentiated way. It is not active pedagogy as usually presented. From our experience of accompanying schools, we know that an ordinary school with simultaneous teaching wants to keep an “ordinary school” character and is not ready to make the students work most of the time in groups on transdisciplinary projects, which we do not offer.The two crucial factors in transforming an ordinary school are:- support the teacher's posture change in class (coaching),- offer ready-to-use course material allowing autonomy and differentiation.Point 1, teacher training and transformation process, was successfully addressed in the Erasmus + SchoolTransformationLab.eu project which ends in August 2020 with other partners.Point 2 is the “exercises” part of the course material, ie school booklets for students. This is what we propose to create and make available to the greatest number via this Erasmus project and will concern the main subjects of students from 8 to 14 years old: French, mathematics, science, geography and history.This proposal excites all the teachers we support. Except ... there is no ready-to-use textbook to work in this way, which slows down the transformation of schools and the implementation of differentiated pedagogies.Therefore, the partnership composed of a school and a center for educational innovation (Ecole du Dialogue), a university (Université Paul-Valéry de Montpellier), a training association (Allagi) and the aim of a platform for teachers (Teaching.be) is to develop ready-to-use exercise material allowing the change of posture of the teacher in the class and adaptation to the level and needs of all students.