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Go to Exams → Grades Config.
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Find the grade in the list, then click the ⋮ menu at the end of its row.
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Choose Edit.

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Update the grade name, grade point, mark range, or remark.
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Click Update Grade to save.

💡 Tip — Toggle Class-specific grades on if this boundary should only apply to a particular class, instead of the school-wide (General) scale.