I am a longtime sailor who grew up learning along with my father. H got his first boat when I was 5. When it comes to sailing, I think I know a lot. I know however, there is a lot I don't know. I would be interested in seeing an ASA Exam just to see if I could pass and, for my own sake, to judge it's relevance. Part of the reason is I have been teaching my girlfriend more practice how to operate the boat, radios, etc.. than real sailing knowledge. My reasoning being she needs to know what's what and how to turn the boat around and find me if I fall off. We have both been thinking it might be a good idea for her to get some independent instruction.
For a fee you can test out on some ASA courses without taking the course. Pay the fee, pass the test, you get the cert. This applies to the basic courses.