Books n testing companies

<p>hey all..
i hav a pretty silly question. i wud like to know if it makes a difference according to the book that u use as in:princeton,kaplan,collegeboard,or barrons and if the coaching of 1 particular company is best...?
thanks.</p>

<p>I don't know about the others, but I think Princeton Review ROCKS!!
They improved my SAT score 320 pts!!</p>