Clear Creek Independent School District officials are trying to find out how hundreds of seniors managed to cheat on a final exam last month, TV station KPRC reports:

Teachers and administrators at Clear Lake High School grew suspicious when about a third of the seniors had the same answers on an English exam taken before winter break.

“We believe about 200 students engaged in cheating on the final exam for the English 4 test,” said Elaina Polsen, Director of Communication for Clear Creek ISD.

The school district gave all 600 seniors two options: take the test again or have their semester grade calculated without the final exam in it.