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What do you understand by an average student? Can you give some examples of the qualities?

What's the difference between "an average student" and "a student of moderate ability"?

Does "an ordinary worker" mean just like any other worker?
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What's the difference between "an average student" and "a student of moderate ability"?-- Nothing I can think of. The qualities are yours to decide.

Does "an ordinary worker" mean just like any other worker?-- It does, but in context it usually means something additional like 'not highly skilled / an executive / a professional'.
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An average student to me is a student who does what is expected of them but perhaps without fully exerting themselves.

A student of moderate ability could suggest that they will pass but without a high grade no matter how the exert themselves.