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In this work, through the research which was organized in one high school, the influence of exercises on the final result in the elearning environment at the final test done by students will be shown. The research was conducted in the subject of informatics in years I, II and III. The questions included multiple choice, open-end and matching questions. The aim was to see how much influence these online exercises had on the final outcome. This was demonstrated through the final informatics tests taken by students in a classical way in the classroom, after the completion of teaching of the subject matter planned according to high school rules. In the research, care was taken to provide the conditions necessary to conduct the experiment with regard to technical requirements allowing students access to the blended system of teaching. Recent experience has shown that the young like to use IT and communication devices. In order to secure the necessary conditions, a survey was conducted among the students about meeting the technical preconditions of access to online testing and about students' knowledge of work with the Claroline LMS platform. The aim was to increase motivation of high school students with regard to the use of online materials, because in high schools almost nothing is being undertaken concerning the implementation of new information and communication technology.

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There is the specific situation in secondary schools regarding students' understanding of the importance of acquired knowledge which they need for the continuation of their education. Therefore, nowadays it is necessary to introduce innovative forms of knowledge acquiring such as blended learning. The intention is to build an adequate model using Mamdani Fuzzy Logic in terms of better motivation of students with higher and lower metacognitive skills for the online part of teaching. The aim of applied Mamdani Fuzzy Logic method is to determine the best ratio of number of logins on the LMS system, test results and time spent on the LMS system that would give the best results at the final testing. The achieved results show that the applied method effectively determines the best ratio of these three variables in order to achieve the best results at the final testing of different groups of students according to metacognitive skills.  Index Terms-mamdani fuzzy logic, number of logins, test results, time spent on the LMS system, online course efficiency.