For the visualization of diploma policy (DP) achievement, we analyzed grade point (GP) of classes on subjects associated with competency (CPT). Visualization of students’ DP achievement became possible. When we divided DP into eight items, which responded to each CPT respectively and showed a radar chart with a calculation of the average grade points (AGP) in categorized class subjects. AGP for every item was compared among all students who were classified into six types, Those classifications were as follows all excellent evaluation, confined excellent evaluation, average evaluation high and low evaluation mixture, confined low evaluation and all low evaluation when compared with the average. We administered a self-check DP achievement questionnaire to the students and compared the results with AGP, Students were then classified into four types, self-underestimate, self-overestimate, appropriate low evaluation, and appropriate high evaluation. There were many female students in the self-underestimate type and many male students in the self-overestimate types. AGP analysis of class subjects associated with CPT is useful for the visualization of DP achievement and shows promise as a new student evaluation.