At least 80 students at a high school in Georgia cheated on their final exams, all thanks to a photo that circulated on social media, school officials said.

Teachers at Dacula High School in Gwinnett County believe the social media post made during the last week of classes originated from someone outside the school, but administrators spotted it and busted dozens of 10th-graders for cheating on their finals in language arts, chemistry and world history, the Gwinnett Daily Post reports.

No seniors were involved in the cheating scheme, which won’t impact any student’s upcoming graduation, according to the newspaper.

But every student caught cheating must now retake the exams, WSB-TV reports. A “preponderance of evidence” led school officials to confirm which students were involved, school officials said without elaborating.

One senior at the school who did not cheat said he wasn’t shocked that fellow students were caught since he heard about it from others. The massive scope of the scheme, however, was surprising, he said.

“They passed out this little paper and took a picture of it and wrote it on their hands and stuff,” student Jedidah Adetoye told the station.

School officials believe the answers might have been posted by a student at another school in the district who already took the exams, WAGA reports.