Over the past 30 years, Uzbekistan has developed a fascinating language equilibrium. There are language laws on the books, but they are not enforced. An important consequence of this is a kind of tolerance and harmony between groups. https://eurasianet.org/uzbekistan-officials-may-be-tested-on-knowledge-of-native-language

A great example is this interview between @legalayzz and @nikmccaren. They weave in an out of Uzbek and Russian in this interview.

Russian no longer had the status it once did. I've seen a dramatic drop in Russian language over the past 20 years since I've been visiting. Many officials I've meant don't speak Russian well, but speak great English. Many speak neither.

Many regulations and gov't documents are written in Russian. This is a problem. People joke that government officials write documents in Russian, so that people cannot understand what they do. There is a need to ensure that documents are written in Uzbek. It is imperative.

Using blunt instruments of exclusion - such as exams - could harm this delicate equilibrium, which fostered a gentle tolerance and mutual acceptance. Surely, there must be more positive ways to incentivize Uzbek language than exams, which will lead to humiliation and alienation.