I wish more people were like you. Not many boaters are out on the water enough to stay up on even the basics so an annual review of the rules, lights
, nav aids etc is an excellent idea (I did a few of the flash cards and it comes back to you, but I had to think for a few minutes on some of them) . I home studied for the exam, and passed, but I think I would have retained more relevant info if I had taken the class, and it wouldn't have taken me nearly as many hours as it did not knowing what to study (had to study it all). Like you, I was just doing it for my own education. Your odds of passing are statistically pretty poor doing it on your own.