<p>"Overstates its usefulness"? Perhaps your eleven-year-old's test was different, but these days prime questions are to be expected on the SAT. And given that most of today's students can't rattle off the primes, most will find themselves listing them--or trying to--in the exam room. That is why I think students can reasonably expect a 10 point gain from having this program. In my case it would have been 20.</p>