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In connection with the harsh situation in the world in the spring of 2020, there was a problem with the organisation of school education throughout Russia. This article is devoted to the influence of distance learning on the results of the unified state exam in Mathematics (profile level). First of all, the dynamics of the total number of participants in the Maths exam over the past three years was considered. The article goes on to analyse the changes that occurred in 2020 in the content of control and measurement materials for Kostroma Region. The results of the exam participants were analysed in several groups – those who had not reach the minimum score, those who had scored 40 points or less, from 41 to 60 points, from 61 to 80 points and from 81 to 100 test points. Methods of qualitative and quantitative assessment (Pearson's criterion is applied) of percentage distributions of results of exam participants in various groups for 2019-20 years are described. Conclusions are drawn about the impact of the distance learning period on the results of the Maths exam.

The influence of distance learning on the level of preparation of participants of the profile-level Mathematics unified exam of the Russian state