OF POLISH DESCENT

descent /dɪˈsent/ [UNCOUNTABLE] the origin of your parents or other older members of your family

be of Irish/Polish etc descent: They’re all of Irish descent.

    by descent: My mother is German by descent.

Source: https://www.macmillandictionary.com

C1-Reading test_4th February_2019 (pages 4-8)
C1-Listening test_4th February_2019    - audio - answer key
C1_Photocopies from 6th February 2019