Doctor of Science and Bachelor of Science offers private tutoring or remedial courses in mathematics, physics and chemistry for students of upper secondary education (4th, 5th and 6th / Rétho), all levels. My experience as a university assistant and through private lessons allows me to offer a serious educational follow-up of problematic, poorly understood or more difficult subjects. I make sure that I understand the concepts to be reviewed and apply them with the student via the exercises of his own classes. A block of 2 hours in a row / week for a month, the time to catch up a poorly assimilated material seems to me the best approach to succeed. One or two sessions of revision / refresh before the sessions of December and June allows to associate definitively the subjects and to check their control.