To make the sentence more precise, the two correct revisions would be:
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Replace "students" with "the 12th grade class officers": "The 12th grade class officers were late to the meeting."
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Replace "late" with "delayed getting": "The students were delayed getting to the meeting."
Alternatively, if you want to keep the focus on the student council aspect, you could also consider:
- Replace "meeting" with "student council meeting": "The students were late to the student council meeting."
Any combination of these can make the sentence more precise depending on the context you want to emphasize.