For most people, the best test prep courses will only raise their scores 200-300 points, tops. And some simply do well on standardized tests. I bought 3 SAT books. I've only done one test out of the BB, read the math refresher in Gruber's SAT, and din't even open my Barron's SAT 2400. And I scored 2280 on my first try.
So no, none of these options really apply to me all that well.