Often, students work a lot on science subjects without progressing in them. I think this is due to poor technique not acquired in most high schools. I think that this area is not negligible and is decisive in the student's learning, I therefore propose to improve this point: help the student not only in learning the course but also and above all in improving of the learning technique. I teach physics, I master all the areas studied in middle school, high school and preparatory classes (electronics, optics, mechanics, electromagnetics, fluid mechanics, waves, etc.), the same for chemistry (dosage, chemical reactions , christography ....) I teach maths, I master all the areas studied in middle school, high school and preparatory classes (functions, probabilities, linear applications, etc.)