ACS stands for 'American Chemical Society'. ACS grade will mean Chemicals meeting the standards set by the society.
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They will be in Grade 3 . Grade 1 : 6 Grade 2 : 7 Grade 3 : 8 Grade 4 : 9 Grade 5 : 10 Grade 6 : 11 Grade 7 : 12 Grade 8 : 13 Grade 9 : 14 Grade 10 : 15 and so on.
It is second grade or you can say 2nd grade.
Grade S:Super. Grade A:Awesome. Grade B:Better. Grade C:Cool.Grade D:Darn(Down). Grade F:Failure.
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sevened grade unless you get held back