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Valedictorian.

A valedictorian is a student who has the highest marks/grades in a particular group of students and who gives the valedictory speech at a graduation ceremony.

Oxford Advanced Learner's Dictionary Online.

In the News:

"There were no other students at the school with marks as high as Kymberly’s, but she wasn’t the only one at graduation named valedictorian. Instead, she was forced to share the title and honor with another student whose grade point average was lower than her own. "
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In Educational Material:

" Oh, there’s the dean and I think that’s the commencement speaker behind her. You must be really proud of your daughter. I know I would be if my son were valedictorian."

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