1925/2468 – 1934/2477
          The reign of King Prajadhipok
 

1925/2468
Miss Alice J. Ellinwood was appointed Wattana’s Principal. During her term of service, Wattana Wittaya Academy began to close on Thursday and Sunday afternoon.
1925/2468
The school extended another grade, to teach Mathayom 8. Pupils graduated this grade received School’s Diploma.
1927/2470
Mrs. Artvidhyakom or Mrs. Bertha Blount McFarland, was the President of Women’s Society in Bangkok.
1927/2470
There was a celebration marking a hundred years of Protestant in Thailand at Saranrom Palace under Royal Patronage of H.M. the King.
1928/2471
Wattana Wittaya Academy was the first girl school to enroll in final secondary school examination for boys. 12 out of 13 pupils passed the examination.
1932/2475
28 January, there was an opening ceremony for the original Nielson Hays Memorial Building, which had been built by donation from Dr. Thomas Hays’ inheritance.