Valedictorian is the title given to the highest graduate from a school.
In high school, Jean-Luc Picard had many honors bestowed upon him, including president of the school, valedictorian, and athletic hero. These feats, in part, lead his elder brother Robert to grow intensely jealous of Jean-Luc. (TNG: "Family")
Harry Kim was a valedictorian. (VOY: "Non Sequitur")
In 2368, Elizabeth Lense became valedictorian of her graduation class from the Starfleet Medical Academy. Julian Bashir was salutatorian; however, he claims that he would have made valedictorian had he not mistook a preganglionic fiber for a postganglionic nerve during his oral exams. (DS9: "Q-Less", "Explorers")