Master student at EPFL, I would be happy to help you (you or your child) for the subjects where you have difficulties! At university, I have been an assistant in Chemistry for the first years of EPFL for a few years as well as for a course linking mathematics and electronics, called Signals and Systems. So I am used to teaching and explaining concepts to students with difficulties. I also give private lessons to students passing the Swiss maturity or the French baccalaureate. To try to see together the difficulties as well as the misunderstandings: we go back to the lesson together, we do an exercise together and then I let the student do it independently and we review together if he is blocked or if we need to correct. I would be delighted to be able to help you in all matters, both scientific and literary! :)