Accuracy of Princeton review CAT

I have a 2010 Edition if Cracking the GMAT. Are there any major differences between 2012 and 2010 edition?

Princeton verbal is really good- quite gmat like(SC's are sometimes slightly easier, RC and CR at par), however the scoring is way too harsh.

With 4 mistakes in 41 it gave me V-39 !!!. The mistakes are very skewed as to give any idea of the level and the first 10 weight age etc(1,9,31,38). Gmat prep gives u 40 for around 8-10 mistakes depending on the level of questions u erred on and the position of mistakes.

So in all Princeton verbal is good practice.

Quant is ok. But I would take princeton mainly for the verbal stuff.