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All answers having "Grade" as clue:

3 Character Answers:

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SCH



4 Character Answers:

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HILL

MARK

RANK

RATE

SORT

STEP

TIER



5 Character Answers:

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CLASS

SCORE

SLANT

SLOPE



6 Character Answers:

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ASSESS

DEGREE

RATING



7 Character Answers:

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CALIBRE

INCLINE

MAKETHE



8 Character Answers:

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EVALUATE