Check out this post on my Blog CCO is the gold standard..... https://www.wescraneinspection.com/post/why-cco-certification-is-considered-the-gold-standard-for-crane-operators
CCO test prep I recommend reading the crane operators manual every day in preparation for the core exam. And reading the study guide once a day to memorize all the information. Your test results will show how much work you put in.