> What is surprising is that they knew the correct answers.
Nah, they read the answers from the correct answer sheet.
What’s surprising is that they could read enough to understand how to use the answer books to cheat.
In a former life I taught Computer Literacy in a High School, while taking a required computer class at college the instructor asked me to give a young man a who was obviously struggling, a hand. In just a few minutes I discovered what the instructor already knew this young High School Teacher could not read. Yet he had a credential.