Took the perio section. Make sure your perio probe is accurate. I compared a few 3/6/9 probes, and some were off by 0.5mm. Pick the probes with the shortest 6mm marking so that your 5mm pockets are easy to identify. I asked my patient how they checked the remaining calculus. There's a language translation barrier, so I didn't fully understand, but he essentially said that two examiners quickly probed interproximally, while a third was more thorough. He said they checked the posteriors from the lingual and the anteriors from the buccal (I did all maxillary). I bought all new scalers, because I can't sharpen instruments... The after 5 instruments by Hu Friedy were great. They're a bit thinner so they're easier to get into tighter pockets. A hygienist gave me another instrument, can't remember what it's called, but its a posterior sickle scaler, and it worked great for tight pockets and hard to reach areas.
In regards to the previous poster, the post was not addressed to me, but I'll answer part anyways. I used Mosbys NBDE part ii first aid, WREB Busters, and the reference books in the WREB manual. For the perio section, none of the references really helped much. I can't really say what it is about the books, but maybe it's that the books go into more detail about physiology and processes, whereas the exam was more broad? I'm not sure. In any case, it seemed like you had to draw on your prior experiences when answering perio questions. I'd still read one of the reference books anyways, just as a refresher. I read the pertinent sections of fixed prosth, but again, your own prior experience cutting preps is a better guide. Other than knowing optimal reduction amounts, the book is not useful. I read the complete and rpd denture books. It was a nice refresher, but overkill for the exam. If you feel comfortable about dentures, then the board buster book or Mosbys is all you need. If you don't remember anything about dentures, you may want to read a textbook.
Bottom line is that the more prior knowledge you have on the subjects, the more you can rely on review books. If you don't have a decent understanding of the concepts, the review books will feel disjointed and not make as much sense. Thus you'll have to go to the textbooks for a more thorough discussion of the topic. And then topics like implants aren't really discussed at all, in the review books or the implant book I looked at, in regards to what the exam is looking for.