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Go to Exams → Manage Exams.
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Find the exam 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 academic term, exam name, classes taking the exam, dates, or the Continuous Assessment / Exam percentage split.
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Click Update Exam to save.

💡 Tip — Uncheck Only show this exam in Manage Marks during its window if you need to keep marks entry open past the exam's end date.