Instruct: Classify Amazon reviews into positive or negative sentiment
Query: so far so good

I haven't taken the test, yet, so I can't say for sure how applicable this book is to the actual test, but I am finding the Kaplan to be very well written. It appears to go into the right level of depth without overwhelming you. I find the examples very helpful.I also have the ARCO (difficult to find as it is out of print) which came highly recommended. The Arco book is more concise than Kaplan (about half the pages), but for unfamiliar material it feels like a memorization fest. The Arco, however, may be more on track with what is actually tested by the GRE (or so I hear). So the combination of the two books is what I hope works.I have leafed through the Princeton Review, and it seems even more concise than the Arco. Doesn't work for me, but I don't have a full major in Psychology. If this is all just review for you, PR might be fine.