Received results today that I passed the April 2016 Chemical PE.
I have the following study materials:
NCEES Chemical Engineering Pratice Exam, PPI Chemical Engineering Reference Guide, PPI 6 Minute Solutions, PPI Pratice Problems, PPI Quick Reference Guide. I'll take 80% of the list price on ppi2pass.com
In all of these I have a lot of commenting, cross-referencing to the Quick Reference Guide, so if you are a person who needs a clean book, probably not for you; however, if you are a person that finds it value added that for every single problem I created a summary sheet and added that to the backs of the book - You may be in business! I also wrote in some notes about fugacity, activity coefficients, and other mass trasnfer concepts in the quick reference guide that weren't covered in the CERM.