This course is intended for students seeking support, deepening or follow-up in mathematics, physics, chemistry, or SVT. I used to give lessons for 5 years now, and I can give lessons for all levels until the final. I mainly base my lessons on targeted exercises, allowing the acquisition of the method above all, and I favor understanding over raw learning, although learning is also essential. In my opinion, it is understanding that must prevail and I therefore try to convey this idea so that the student can also cope with an unknown situation in the exercises, and that he has confidence in himself and in his knowledge .