In engineering school, former student in a high school of excellence in Paris, valedictorian in preparation, I give private lessons in mathematics, physics and computer science. There is no secret: it is by forging that one becomes a blacksmith. I accompany middle school and high school students with advice so that they understand and remember easily. I help both to assimilate the course and to give tips and methodologies. Tell me the chapter you want to work on, and I will prepare interesting exercises. I often learned things with friends, in a work group. This makes me someone comfortable to exchange, give advice in order to understand the key concepts. With a training of excellence very oriented towards the sciences, I will enlighten you on the chapters that are problematic for you.