Student in physiotherapy and rehabilitation at the University of Liège (ULG), having validated in France a BAC +2 Biology (option Biological and Biochemical Analyzes), provides private lessons in chemistry and biology. This course is for all high school students who are struggling or want to increase their average. Having myself had gaps in chemistry younger, I found tips that allowed me to be effective in these matters. The validation of these subjects during my first year at the ULG (17.06 in chemistry and 16.47 in biology) and positive feedback from the friends I helped motivated me to offer these courses of support. The main objective is to restore the student's confidence by reconciling him with these subjects. To do so, I focus on three essential points in trying to stay as entertaining as possible: - working methods - understanding of the course - reflection and analysis of problems I have already done math tutoring for four high school students aged 14 to 17.