having taken the CGC test three times (failed once, passed the other two times), all under different evaluators and in different environments and testing conditions, there's a lot of variability in the test, the evaluators have a lot of room to conduct the test according to their personal preferences.
Two of the evaluators gave my dog commands during the supervised separation (they said they wanted to see if he would listen to instructions from other people not just the owner, or if he was not so upset at my leaving that he couldn't obey commands from other people), and thus he didn't whine or cry with them since they were giving him something to do besides watching me disappear. But another evaluator just took his leash and ignored him so he was staring at me walking away and disappearing and he whined, and then of course we failed (if you fail one exercise you fail the whole test). there were a lot of other variations in the other exercises too.