okay for starters... who ever recommended nurse anesthesia textbooks for the ABA in-service exam is smoking crack or hasn't actually taken the exam.
The exam covers a lot of topics: general anesthesia, ICU care, peri-op care, pain management, regional blocks, and will touch on far off topics like pediatric cardiac anesth and other stuff....
The best way to prepare for this exam is to not worry about it... Your score is inconsequential, as you are being compared to other people at your level taking the test. The test only matters when you take it for real at the end of your 4th year... But if you want to take it and not feel like a stranger in a strange land, read through Baby Miller... Another good prep book is Faust's Review.