All three photographs appear to have been taken at the same school [possibly a girls' school in Wimbledon or Putney?], as follows:
1) Group of pupils in what appears to be a school assembly hall, possibly at a musical event, inscribed on back in pencil ‘P Davy’;
2) Gymnastics display in a school yard, inscribed on back in pencil ‘P Davy’;
3) Group of pupils in a school dormitory, inscribed on back in pencil ‘D Mann?’.