Candidates enrolling for studies in English using the IRK system should attach a document with confirmation of knowledge of English at a B2 level, in addition to the complete set of required documents.
A list of documents accepted by UW is available here. Candidates who do not have any of the certificates from the list may take part in a central language examination.
Yes, the candidates who have not reached the age of majority according to Polish law (18 years old) are required to attach to the set of required documents a declaration by the parents / legal guardians.
Example of the document is available in the link.
The confirmation of submitting documents within the deadlines is the date on a post stamp which should be one of the dates mentioned at the admission schedule for submitting documents. Even if the documents will rich our office later, but the date on a post stamp will be correct, the documents will be accept and will be process further.