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)
Counterpoint: Like 80% of bilinguals in Latin America (myself included) have American culture brainrot as a result of being able to go on anglo internet.
Synthesis: Mandatory bilingual policy, the English language is officially forbidden.
But if you can understand the enemy, you can understand how to get into its beating heart...
That being said, it's not necessarily a bilingual problem than a Western cultural one, eh?