The manual contains explanations on specific examples of basic concepts, physicochemical quantities, laws, the most important equations and reactions in general inorganic and organic chemistry. Exercises and transformations of organic and inorganic substances are given, examples of which reflect the close relationship between different classes of compounds and allow the applicant to independently test the skills and abilities in compiling various chemical equations. The purpose of the publication is to help school graduates entering higher educational institutions, students of preparatory departments to independently repeat, systematize and deepen their knowledge of the school chemistry course.