I just took an online self-study course on Home Canning and Preservation offered by the the National Center for Home Food Preservation through the University of Georgia.
I have to say that I knew a lot but learned quite a bit as well. It also helped to solidify some things I was a bit shaky on. They have you take a pre-quiz before each section. I didn't pass the pre-quizzes but scored between 70-90%. After the section, you'll have the opportunity to take the same quiz up to two more times. If you pass the course with greater than 70%, you will be sent a certificate saying that you completed the course.
The course is free of charge. Click on this link http://www.uga.edu/nchfp/index.html and scroll to the bottom. You'll see a little sign that says "Preserving Food at Home--Self Study". Under that banner there will be a teeny tiny link to sign up for the course. It took about a week before I was sent the link and password for the actual course.
You have up to 6 months to complete it. Having done a bunch of canning, I didn't feel it necessary to actually go through the exercises they give you. They teach you to can apples, tomatoes and something else that slips my mind. If you mess up, they give you reasons for the problems. I did find it to be very helpful.
I completed the course in one day. If you're familiar with canning, it takes about 2 hours or so. I was also doing laundry, homeschooling and general mom stuff.
Let me know if you take the course and what you think.