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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 Delete.

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In the confirmation, type the grade name exactly as shown (for example A1) — the Delete button turns on once it matches — then click Delete. This can't be undone.

⚠️ Note — Removing a grade band leaves a gap in the mark range it covered. Marks that fall in that range may no longer translate to a letter grade on report sheets until a replacement band is added.