The recommended path to Pega Marketing Consultant Certification (CPMC) is to take the following Pega Academy courses in sequence:
Decision Management Essentials
Both of the above courses are available on the Pega Academy self-study website.
I would suggest after taking the courses that you download the associated student guide PDFs for offline study reference material (link to download is found within each course after enrollment). The online courses also have knowledge check quizzes at the end of most lessons which is helpful for knowledge retention.
After taking the self-study courses, prepare yourself further by studying the above mentioned student guides and take the lesson quizzes. All test questions are based on the self-study lesson content, referenced PDN articles, and experience (exercises). The CMPC exam topics and test weight percentages per topic can be found in the downloadable CPMC exam blueprint found here: http://vue.com/pegasystems/cpmc_exam_blueprint.pdf.
If you are a stakeholder in the project and not necessarily interested in certification OR, if you want a high-level introduction before you start on your certification journey, please take the shorter course: Introduction to Pega Marketing
As previously stated, the only approved study materials available for CPMC would be the associated course materials which are downloadable from respective self-study courses on the Pega Academy website.