I took the full kaplan course, and I found that the kaplan blue book and the online material were extremely helpful. The Kaplan blue book was the only book that i used to study (I didn't use cliffs or destroyer). In my opinion, it was very good. The kaplan online material was absolutely essential to my study strategy. I suggest purchasing only the online material. However, it's still very pricey (~$1200). So it's up to you. I'm sure you can still do pretty well without it. But, for what it's worth, I'm very sure that I wouldn't have gotten my score without that online material.