It depends on the grading system; all are not like yours. I gave you the top grade, but on a second thought I think your exam wasn't that good and therefore I'll subtract two grade points / two points / two percentiles from your final grade.
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InterventizioBut what are the single "units" that form the grade called?In my experience I find that the British use 'marks' and the Americans use 'points' for those units.