PM&R recap is a waste at this stage in my opinion. It just covers the basics - if you don't know that by the time you're taking boards you have bigger issues.
j4pac is right that if you want to study something to set you apart, the red book details hold the key, though this close to boards may be too late to really learn all the minutiae. But remember, you don't have to do amazing on the test, you just have to beat 5-10% of your peers. There's only a limited number of resources out there. Use the resources everyone else is using (pick a couple at this stage), lean back on what was hopefully good residency training, and you'll likely be fine unless you're a terrible test taker.