I enjoyed reading the course but some of the quiz/exam questions focus on rote learning - ie memorising certain dates/facts and regurgitating this for the exam. I personally don't feel that these questions test the right things. Dates are nice to have but are soon forgotten and are not really of any practical relevance.
What would take this course to the next level is to have questions that focus on the application of knowledge. For instance, you could have questions that provide photos and require candidates to rank pearls in terms of quality, highest luster etc. Or to discern certain characteristics such as irridescence or specific overtones etc. It would also be great if each section provided photos of varying quality grades - from commercial to gem.
A fun idea could be a photo of three pearls - for instance a white Tahitian, WSSP and akoya/Edison and ask candidates to identify each pearl.
Another comparison photo could be freshadama, akoya and metallics (a comparison that often comes up on this forum).
I echo earlier comments in saying that the best source of learning for me has been these forums. The best way to develop an eye for quality is to see as many pearls as possible in real life. The next best option, and the option for which I'm grateful, is taking advantage of the breadth of knowledge available on these forums. I have learnt so much from reading all the threads, and seeing all the photos, especially those that compare vendor and customer photos.