CORONA DEL MAR (CBS) — After 10 Corona del Mar High School sophomores bought test banks on Amazon.com, school officials Friday are considering whether to have students retake the test or discard the scores.

An anonymous note, mostly likely written by a student, alerted a history teacher to the cheating, Principal Tim Bryan told the Daily Pilot.

Test banks are provided by textbook publishers to teachers and provide chapter-by-chapter questions for tests. Some students and parents may have believed the test banks to be legitimate study guides, Bryan said at a PTA meeting Wednesday.

Parents at the meeting said the gossip among students was that those involved in the cheating knew they were not supposed to have the test banks and were also trying to sell the information.

Bryan said a district official called the publishing company, which yanked the test bank off Amazon.