Wiki E/M Auditing Step - selling this book

I'm looking at buying one or more of Carol Buck's Auditing Step books to prepare for the CEMC next month. I see E/M Auditing Step, and also a "The Next Step: Advanced Medical Coding and Auditing". I've also already ordered the study guide and practice tests from AAPC. Does anyone have any opinions on these Carol Buck books? Appreciate any input anyone has.

Thanks!
 
I'm using Carol Bucks The Next Step in my college class. It's pretty detailed and covers ICD-9, CPT, and HCSPCS.
 
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