The academic achievement calculation and class determination system according to an embodiment of the present invention relates to a student's academic achievement calculation and class determination system at an academy that operates a plurality of classes according to subjects and levels, and each of the students' national mock exams an input module that has received a ranking for each subject; a rank calculation module for calculating ranks in the entire academy and in the classes based on ranks for each subject of the national mock test; a grade improvement achievement calculation module for calculating the grade improvement achievement grade of the student based on the data received from the input module and the rank calculation module; and a class determination module configured to determine a future class for each subject of the student on the basis of the student's achievement level for each subject calculated by the grade improvement achievement calculation module.
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