The revamp of Singapore

Write a persuasive argumentative essay on the revamp of Singapore PSLE grading system.
Must anticipate objections and provide counterarguments.
Relevant information would be:
Definition of T-score
Issues (moral, ethical, social and etc.) surrounding the PSLE grading system of using T-scores
Arguments for upholding the PSLE grading system of using T-scores
Arguments against upholding the PSLE grading system of using T-scores