Hi
According to my 1937 map, the school was situated between Calvert Road and Annandale Road, at the junction with Woolwich Road.
Using google maps streetview, I would suggest it's now been replaced by a housing estate.
According the the London Metropolitan Archives catalogue, Calvert Road School opened in 1879 and was renamed Annandale School in 1951
Their catalogue reference is
LCC/EO/DIV06/CAL
They do have some surviving records, the latest ones are not available to view though.
Dawn