Noor Academy

You cannot read the Quran during those days, even Surah's or Dua's from the Quran that you have memorized, you cannot read those by memory. Reading the Quran or anything from the Quran is not permissible during those days. Looking at the Quran as long as you're not touching, or reading it, is permissible. (Noorul Idhah)

You can read any Surah during witr. If you mean instead of Dua e Qunoot, you can read Surah Kauthar or Dua Allahumma Rabbana Atina fid duniya hasanatun wa fil akhirati hasantun waqina azaabun naar. Even if this is difficult you can read, Ya Rabbi three times. (Noorul Idhah Kitaab us Salaah)

There are 211 Mansookh ayaat and 80 Nasikh ayaat.

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There are 43 Surahs which don't have any Nasikh or Mansookh ayaat.
There are 40 Surahs which include Mansookh ayaat, but don't have any Naasikh ayaats.
There are 6 Surahs which include Nasikh ayaats, but don't have any Mansookh ayaats.
Finally, there are 25 Surahs which include both Nasikh and Mansookh ayaats.