"Finished first in a class"??

Question

She finished first in her high school class.

or

She finished first in her class in physics.

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Those sentences are about Marie Curie. What does "finished first" exactly mean? #___#

Answer 1

"finished first" mean that she got the highest mark in her high school class and in her physics class...

Answer 2

She had the highest grades or scored the highest. She was the top scoring aggregate in her class.

Answer 3

She had the grade point average of the class.