The phrase "school classmates" refers to the other students who are in the same school as you and are in the same grade level or class as you. Full definition
Encourage them to speak with their future roommate, other high school classmates who are attending the same college, and student officers in the clubs your child may be interested in joining. (edutopia.org)
This can be as easy as emailing law school classmates and putting something together. (lawyerist.com)
Look around you and think of your high school, college, and graduate school classmates who have not made it to this stage. (sciencemag.org)