Investigators say the teen from Markham, Ont., was arrested last week and charged with making indecent communications.
York police Const. Laura Nicolle says the suspect was part of that Grade 12 class.
She says a high school staff member reported the incident to police on April 15.
The teen is expected to appear in court on Dec. 8 in Newmarket, Ont.
This report by The Canadian Press was first published Sept. 24, 2020.
This story was produced with the financial assistance of the Facebook and Canadian Press News Fellowship.