Online cheating on graded school work is a real problem. Sites like answers work very well for many assessments taken at home and at school. Even math problems are solved online. My more open students love to take an online class, they claim "[they] finish in a day, get an A. What are friends for?" With more and more students taking online courses, the irregularities in grading remain unresolved.
AP, IB, and Cambridge tests are proctored and are identical to all takers. Their results have integrity, if not validity. As a teacher who has offered courses from many online curriculum providers, I deeply know how believable an A or B is from an online course completed at home. Zip. It is what it is.
Taking an AP test is far, far better than taking an online assessment. Newsweek and Jay Mathews have it right from the standpoint of a beneficiary of a school's rigor, which is what really matters.