In short: By the time a person is 18, they must effectively be able to communicate and understand conversationally in 2 languages and casually use them in daily life..., if not become completely fluent...
Other than that, any language goes (whether it is a locally-known one, or a popular one worldwide),
The only thing I hope to gain from this, is to rid the world of /Monolingual Betas/
Seriously though, has this been a policy before? Because I haven't heard of such one...
I think this can especially be used for citizenship...
Edit: I don't necessarily have any other presupposed requirements besides bilingualism, though we may have certain notions of such in this main goal
Edit II: In furthering this venture, I have realized that my liberalism may slightly poisoned my lens....
And for clarification...
Minimum dual language system:
Main national language + other language (likely another related language, but foreign ones are fine)
Spanish was a mandatory class for two years in my USA highschool back in the 90's.
At best, for a little while, I could barely read it. Never was able to speak it.
Would have been cooler (and probably more effective) to have it be K-12. My spouse is kinda trying to learn Potawatomi in her spare time and this prompts us to occassionally wonder, "Just how did we learn to speak english, anyways?"
(I partially copied and pasted this response, when it comes to your experience)
I didn't mean for mandatory bilingualism to be necessarily related to education, but more or less natural exposure, if not language tutoring by its native speakers...
Having it at K-12 is a good start though ... and how's your spouse doing anyways with it...
Slow. Mostly some words and a few phrases at the moment.