The first day of the kaplan course is a readiness test, then the second day you get your results and they teach you the "strategies" for critical thinking/test taking - every class after that is just going over the answers to all the questions to the test you took and why you got them wrong....
Honestly, I don't think that the class helped as much as actually practicing the questions over and over again (Qbank - you instantly get rationales - so you ARE learning as you answer questions if you use the tutor mode)
Now, if you don't need to work on your nursing content (which if your about to graduate you probably don't but I'm sure it wouldn't hurt to review Peds/OB) then buying the book won't help much either....it's basically nursing school summed up in a book (it's a WHOLE LOT).
Have you researched NCSBN's NCLEX review (the actual people who write the NCLEX)? That helped me a bunch as well, they give you content review and TONS of questions for a fraction of the cost of Kaplan or Hurst. Quite a few people from my school used only this to prepare and have passed.
Here's the website: http://www.learningext.com/