Years ago, this is what got me through my surgical specialty boards. I still have the original cards, summarizing the whole specialty in one place. I also have two extra wooden boxes (hard to find) in case I ever need to use a system like this again!

Keep up with this inspiration!

https://preview.redd.it/po6engapzvrf1.jpeg?width=3000&format=pjpg&auto=webp&s=b626a00a4e74715aed55f8e3df559fae6fc68b2c

Done in 1990.