In percentile-based scoring system, students get score based on their percentile: A certain percentage get HD, another get DI/CR and another get PA/NN. For example: 90% percentile get HD, 70% percentile get DI, 50% get CR, 30% get PA and the others get NN. However, in performance-based scoring system, students get score based on their performance. For example: Score 90/100 means A, 80/100 means B, etc, ...