If I remember correctly, at the start of the kaplan review course, you sign an agreement that after you take your boards, that you will "destroy" the review books...so you don't decrease kaplan sales the next year, so watch our for the copyright police. I thought it was worth the time to go through them all one time, then I focused the rest of my time on Goljan, first aid, Micro review, and Neuro review. Took the USMLE, then spent 1 day reviewing our schools 2 hour comprehensive OMM review and did fine on the comlex. I especially thought the kaplan books helped me solidify physiology and immunology.