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)