It represents how well the student is undertaking in the disciplines. As pointed out, it is the equivalent with the GPA. It can be calculated by the following formulation: C R = ? k = 1 N C C i ? file ( N i ) ? k = one N C C i displaystyle CR=textstyle frac textstyle sum _ k=one ^ NC C_ i cdot file(N_ i )displaystyle textstyle sum _ k=1 ^ NC C_ i d