It represents how perfectly the student is undertaking on the disciplines. As mentioned, it's the equivalent in the GPA. It could be calculated by the next formulation: C R = ? k = 1 N C C i ? f ( N i ) ? k = 1 N C C i displaystyle CR=textstyle frac textstyle sum _ k=one ^ NC C_ i cdot f(N_ i )displaystyle textstyle sum _ k=1 ^ NC C_ i displaystyle