Having always liked scientific subjects in general, I had a BAC S specialty maths with honors and I study maths and physics in preparatory classes for the Grandes Ecoles (MP) at Lycée Masséna. I therefore give math and physics lessons at college and high school level in order to help students understand the lessons, apply them and thus progress. My methodology depends on the level of the student, so I start by explaining the course to him in a simple way. Once he has understood the lesson, I make him do appropriate exercises (or those given by the teacher) by gradually increasing the level of the exercises according to the student's mastery.