Featured3e · Geometry
Recognising when to use Thales
The configurations to spot before calculating, and the most common proportion mistake.
3 min read · Oct 14, 2026ReadResources
Maths explanations by year, with the classic mistake of each chapter, guides for the Brevet and the Bac, and articles for parents and teachers. Filter by topic or search for a chapter.
Latest resources
7 published resources
- Brevet · Guide
Revising Brevet maths starting from what is fragile
The key chapters and the trap in each, then a Brevet practice paper in Coach.
- Bac · Maths speciality
Maths speciality Bac: know what is solid before redoing everything
Première and Terminale, chapter by chapter, with the trap in each.
- Maths · Curriculum
The maths curriculum, year by year
6e to Terminale: the chapters, the concepts, and where to start.
- Teachers · Evidence
How we run a classroom pilot
Context, participants, observation, measure, limits: how we publish a pilot.
- AI & education
What the AI does in Coach, and what it doesn’t
What goes to the models, what stays with us, and the mechanisms we will never use.
Every resource states its author, its teaching review, the year and curriculum it covers, and when it was last reviewed.