For a dozen years I help students and students in mathematics and physics-chemistry. I make a skills assessment during the first class and I commit to quantitative results. I can indeed certify a quarterly increase of the notes between 1 and 4 points according to the file taken into consideration. This rare positioning is the consequence of a permanent optimization of my teaching methods and especially of a real ability to perfectly detect the learning structure of each of my students. During school holidays, I do courses in private lessons.