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Go to Classes → Manage Classes.
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Find the class 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 class name exactly as shown (for example Primary 4) — the Delete button turns on once it matches — then click Delete. This can't be undone.

⚠️ Note — Deleting a class is hard to reverse. If students are still enrolled in it, move or promote them first (see Promoting Students to the Next Class/Year) before deleting.