Student at the Department of Geology at the Ecole Normale Supérieure (ENS) in Lyon after two years in preparatory class BCPST (Biology-Chemistry-Physics and Earth Sciences). I propose courses and personalized help among the following subjects: Mathematics, Biology / Geology and Chemistry / Physics. My goal is to advance the student in difficulty in these subjects and to transmit to him a method of work applicable in the long term. The course can also be an aid to the preparation and the method for a control that follows.