This manual is intended to prepare 9th grade students for the state final certification - the main state exam (OGE) in mathematics. The publication includes typical tasks for all content lines of the examination work, as well as 30 approximate options in the 2019 OGE format. The manual will help students test their knowledge and skills in the subject, and teachers - to assess the degree of achievement of the requirements of educational standards by individual students and ensure their targeted preparation for the exam.