Recently retired engineer, I offer Mathematics and Physics / Chemistry courses to high school students in Yvelines or Hauts-de-Seine in the scientific stream (1st or Terminale, S or ES), also accompanying students in prepa class who wish to pass an entrance examination in a school (engineering or business) or adults in professional reconversion via a scientific university course. Throughout my career, I have very often had the opportunity to share my knowledge by providing courses related to my professions to students (Schools, Universities) or professionals in continuing education; since my retirement, I have given private lessons to several students, helping them to graduate and also giving them back the taste for science, which I consider necessary to pursue higher scientific studies. My area of intervention: 78/92: Versailles and nearby surroundings