Each character is listed by their first name and their surname with NO honorifics, suffixes, or middle names included. For example, if Prof. McGonagall or Albus Severus Potter were to appear on this ...
Ginny is in column A, and the 4 Weasleys in the quiz are all in the corners, so Ginny must be in A5. Harry is in the same diagonal as Percy and Ron according to Ginny’s clue, so he is in either B2, C3 ...