Except: they keep changing the system, and therefore things never go smoothly. Last year we had "DOI University" as the training system. This year, it's "DOI Learn", with a new login, new listings, new interface, etc.
I got a user ID and password, work through the course (I actually read it! I promise! Most people jump straight to the tests and do just fine), and pass all the tests with flying colors. About 45 minutes elapsed time, I think. But when I try to click on the "Quit" button to exit the class and get to the certificate part, it gives an error. Repeatedly.