Does anyone know if school class photos were taken at P.S. 25 Brooklyn, in the years 1912-1914. If so, where might they be either viewed, or copies obtained?

https://www.ps25k.com/

Try it. 

Unfortunately, when I contacted them not long ago, they seemed to have little knowledge of the history of their school, let alone any historical records.  Thank you for your suggestion.

That just leaves the NYC Board of Education and NY Department of Education. I believe it was NYC that provided me with a copy of my IQ test taken while I was in school. 

Perhaps try The Brooklyn Historical Society.  If they don't have files of such photos they might know other options on where to find them.
https://www.brooklynhistory.org/
According to their site, they remain closed due to Covid.  I do not know if they are answering e-mails.

Also, you might try The NYC Municipal Library:
https://www.archives.nyc/
They are also closed due to Covid.  There is an e-mail address on the above site.

Regards,

Sherri Bobish
Princeton, NJ