Association is the key to memorization. Find a link for something you want to remember. Some people say songs help because it is easier to memorize songs. I'll bet if you watch this video enough times, you would probably remember most of it by heart.
Animaniacs - Nations of the World
Kidding, I could certainly use this too! My brain has selective memory that I get no say in.
Back in the 1930s a guy named Bruno Furst wrote a book called "Stop Forgetting". Best thing on the subject I've ever read. Lots of the systems that have been sold for big bucks since then have been based on his ideas.
It's still available. Try a Google search and see what it's selling for these days.