O grade
noun/ˈəʊ ɡreɪd/
/ˈəʊ ɡreɪd/
(also ordinary grade)
[countable, uncountable]- (in Scotland in the past) an exam in a particular subject, at a lower level than Highers, usually taken at the age of 16. In 1988 it was replaced by the Standard Grade.
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O grade