While Levertov's poems were not my prescribed text, Mod C is still overall about representation of history and memory, and how these representations are constructed. In my opinion, most related texts for Levertov's poems would probably work for other prescribed texts. Some of the texts that people I know did include: Liberation by Michael Younesi, Persepolis by Marjane Satrapi, Downfall by Oliver Hirschbiegel, Mao's Last Dancer by Li Cunxin, Memoirs of a Geisha by Rob Marshall, etc. However, some of these are quite overdone by students doing Mod C, so I'd probably advise you to use these as examples and find your own unique text.
I don't remember the other titles of texts people in my grade did but I know people did documentaries and interviews, as well as articles and book reviews. There are a lot of places you can look. Good luck finding a related!