It refers to one of the conditions that must be met in order to obtain a long-term resident's EU residence permit or to acquire Polish citizenship by being recognized as a Polish citizen. The official confirmation of the knowledge of Polish as a foreign language is the certificate of knowledge of the Polish language issued by the State Commission for the Certification of Proficiency in Polish as a Foreign Language at the language proficiency level of at least B1. However, foreigners who graduated from a school in Poland and hold a certificate of completion or graduated from a school outside the Republic of Poland with Polish as the language of instruction are exempt from the obligation to present a certificate of Polish language proficiency. Therefore, the official confirmation of knowledge of the Polish language is also a certificate of completion of a school in Poland (e.g. a primary school, junior high school, high school, technical secondary school or a bachelor's or master's diploma with a supplement, which shows that the language of instruction was Polish) or a school leaving certificate for abroad with Polish as the language of instruction (e.g. Secondary School No. 8 with Polish as the language of instruction in Wołkowysk or Secondary School No. 24 named after M. Konopnicka in Lviv and others).
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