valedictorian
n//ˌvæl.ə.dɪkˈtoɹ.i.ən//avskedstalare, avslutningstalare, toppstudent
(US, Canada, properly) The individual in a graduating class who delivers the farewell or valedictory address, often the person who graduates with the highest grades.
(US, Canada, colloquial) The individual in a graduating class who graduates with the highest grades.