CPSM Study Materials - are some better than others?
I am looking to start studying for my CPSM certification without monetary support from my company. Thus, I am looking to do this in the most cost effective manner and noted there are a multitude of study materials on the site; however, I have a feeling not all are needed.
I would prefer to to this self study versus attending a course and was hoping people that have taken the exams could provide input on what helped most to prepare. Are there resources that are more helpful than others (e.g. should I get just the study guide and diagnostic kit or should I get individual study workbooks as well)?
I appreciate any help in advance.