Student at the National School of Geology (class of 2017), I went through a preparatory class for schools (CPGE) BCPST stream to join this school in September 2014 (admitted 12th on main list at G2E session 2014). These two years have taught me methods of work and knowledge in the field of Mathematics, Life and Earth Sciences, Physics and Chemistry that I want to share with a student who has difficulty assimilating his course or who is eager to perfect his methodology of work. The progression of the student will be based on the assimilation of the fundamental concepts presented and their reinvestment through exercises whose level will be in agreement with that of the student. These courses are primarily intended for middle school or high school students, and also for 1st year BCPST students.