Do I need to purchase additional study materials to pass the IDEX California®?

No.  Everything that you need to know is contained in The Original IDEX CA Prep Class^©.

However should you want to purchase a valuable resource, the CLCID California Codes and Regulation for interior Designers is highly recommended.  This manual is a collection of the California Building Codes that pertain to interior designers.  Contact mollyanne@macdesignstudio.com for more information.