The handbook includes all topics of the school course and meets modern educational standards and programs. The book consists of two parts: "Algebra and the Beginning of Analysis" and "Geometry." The main material of the school course of mathematics is presented by the authors in a concise and systematic manner: mathematical concepts, axioms, theorems, properties, etc. The book will be an indispensable assistant in the study and consolidation of new material, repetition of the topics covered, as well as in preparation for tests, final exams at school and entrance exams to any university.