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h0w d0es the percentile system actually w0rk?...like if it bec0mes l0w, can a A turn int0 an A*?.....like can v really rely 0n percentile?
Its actually pretty complicated. First they compare the paper with last year's paper, if it was harder this year than last year, they set low mark boundaries for each grade, if it was easier this year than last year, then they increase the mark boundaries for each grade. e.g if last year's paper was easy, and this years paper was hard, they may drop the mark boundary for an A* in theory from 68/75 to 66/75. This is threshold indicator 1.
Once the grade boundaries are set, they check the average percentage of candidates who obtained an A*, say for e.g 12% of the total students obtained A*s. Then they check the average marks on which the 12% of the students obtained A*s for e.g if the average marks turn out to be 65/75, then the percentile drops further and 65/75 is set as the minimum passing mark required for an A* rather than 66/75. This is indicator 2.
They then average the results of all indicators, recheck many times and distribute the grades according to them.