Im using the Saunders red book. I don't think it has much of a difference with the green book, but it is the most updated so that is why I am using it to review content. I also got the Lacharity book which is good for prioritization questions, but i suggest you start that like 2 weeks before you take your test. and im also doing the online free kaplan question which are really good. I take my test April 8, so I will post how it went. good luck!