This is a survey and analysis carried out by Solidarité Laïque based on exchanges between French teachers on the issues of teaching sustainable development and SDGs. Solidarité Laïque presents 10 proposals to bring Sustainable Development to life in schools and in the formal education system. They foster educational cooperation between teachers/pupils and interdisciplinary dialogue. The publication is available both in English and French, also at: https://www.bridge47.org/resources/07/2020/how-does-peer-mentoring-contribute-education-sustainable-development-schools