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Jul 14, 2019 at 10:18 comment added David Espina That's what test 1 is. If it is filtering, leaving incompetents behind, then the assumption is the competent ones remaining learned something of value and their performance is on average better than the overall pool. I think I could have explained that better in my answer. I'll edit.
Jul 14, 2019 at 8:56 comment added Erik I think this might be missing a third test of worth: whether the certificate actually teaches you to be better at what it claims to be teaching you about. I've seen some that asked questions so inane that while they were challenging to do, weeded out people low performers, those who held the certificate didn't actually learn anything useful from it. Very little of the knowledge in the exam had any useful application.
Jul 12, 2019 at 13:13 history answered David Espina CC BY-SA 4.0