Currently studying in the first year at EPFL, in the Computer Science and Communications System faculty. I offer repetition courses in mathematics and more generally in science subjects, from elementary school to high school level. This course is aimed at students having difficulty in scientific branches as well as students wishing to improve their knowledge or prepare for higher studies in the scientific field. During the lessons, I review the different notions learned at school and try to bring them in a more intuitive and less abstract way. Then we apply these concepts in the exercises. I also focus on developing a method of scientific thinking, in order to solve future exercises independently.