shrutib wrote:I have found some grammar rules doing Google search and found a rule about collective noun:-

Collective nouns such as team and staff may be either singular or plural depending on their use in the sentence.

Examples:
The staff is in a meeting.
Staff is acting as a unit here.
The staff are in disagreement about the findings.
The staff are acting as separate individuals in this example.
The sentence would read even better as:
The staff members are in disagreement about the findings.

Do we see this getting tested in GMAT? Or is "collective noun"always singular?

Can you please explain when is it singular and when is it plural