Often motivated students have academic difficulties, for the simple reason that they do not yet know how to work. My teaching method is to present the best concrete concepts behind formulas that may appear abstract at first glance. Once the student understands the concepts, exercise training will give him the ease he needs. As a student in Lausanne in geosciences, I am particularly comfortable with the scientific language. I propose courses of support all levels in mathematics, physics and chemistry. I have my driving license and a car, and especially a good bike, so I could move!