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I wonder why we should use the preposition in instead of at here

She scored high marks in all her subjects.

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When she is good at math she scores high marks in math.

at here introduces a subject as something to which we apply our efforts and where we use our skills. It expresses the relationship of the student or devotee to the subject.

in in this context introduces a subject as a discipline, a "subject area" in its own right.

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