Percentile grading system compare ones outcome with that of a group and hence the grading cannot be generalized when compared with other groups. Also, it churns only the creamy layers in terms of encouraging to stand out from the rest.
Personalized grading compares ones grading with that of his / her previous numbers. This way one gets motivated by the improvement made each time. Again, the motivation not only happens in creamy layer but across the board and brings in more dynamics.
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