It doesn't have to be bribing others to take the exam for you. I heard that they write down the questions they got asked during the Verbal part of the exam and collect them so other students can memorize them and get good scores. It's been happening for quite a long time actually, a professor of mine told me the same when he went to school in the 80s or so.

On a side note, the notion that a private company conducts all these tests for profit in order for students to get admission into schools quite bizarre and laughable to say the least.