The article is dedicated to the scientific and practical analysis of the level of development of the components of the methodological competence of a mathematics teacher during the development of model curricula in advanced training classes. A review of the scientific literature on approaches to determining the methodological competence of teachers, including mathematics teachers. Attention is focused on the components of methodological competence required for the implementation of methodological activities during the implementation of the State Standard of Basic Secondary Education. The content and organization of educational activities within the module "Educational and methodological support of the educational process of the New Ukrainian School" curriculum for teachers who will teach mathematics in 5th grade in 2022/2023 academic year. Based on surveys and observations in-service training courses, the level of readiness of teachers according to the model curriculum in mathematics in 5th grade is described. With the help of scientific and practical analysis the main shortcomings in the development of methodological competence of mathematics teachers and its components, primarily normative and variable competences, are highlighted. Identified the prospects for further scientific exploration: the study of the components of the positive impact on the development of the components of the methodological competence of teachers of natural sciences, mathematics, and computer science.