Meta-cognition - I recently decided to go back to try and scrub up my school French and see whether I could achieve a basic conversational level. I've been doing a variety of things - using Duolingo and Memrise, listening to radio, chatting to people, reading books, watching films. But I decided that I wasn't going to treat it as learning but purely to allow the language to flow into me. It's worked spectacularly well - to the extent that I now have café-level French (I can give and get directions, can talk to people in shops, etc). It really works so much better than lists of verbs and nouns and trying to beat yourself up as I did in school over formal learning.

As for this insane test, how's about a bunch of Catters get together and offer a course in it… I can't offer, wrong country, but it would be fun - ask a tech that's local to you if you could offer a course (using the book of cheats), and do it in a way that people would enjoy, with questions and the answers given and explained, plus music swaps from the English catters to the students from various countries. And a small party with multinational food every time a student passed!