Official site for Poland's state Polish exam: dates, centres, sample papers.
Details
The state certification of Polish as a foreign language is what counts for citizenship, university admission and many employers, and this NAWA-run site carries the exam calendar, the list of examination centres worldwide, registration and the official format information. Even if you never sit it, the published requirements are a useful map of what each CEFR level means in Polish. Information only — no teaching material, and mostly in Polish.