Graduate of a Master in Chemistry of the ULG I give courses of catch-up / refreshing in chemistry-physics, biochemistry (+ method of work). My teaching method is to make a first contact with the student in order to take stock of the knowledge and the gaps, then to meet the needs of the student in a targeted and effective way. In addition to answering questions I like to approach the working method, because according to my student experience it is a key element of success. At the end of each session I usually summarize the lesson, emphasizing the important points of the topic.