This could be the original home of Gidea Park College in Balgores Square, from which it moved in 1924.1

Alternatively, it might possibly be the school run by Miss Knight (Gidea Park school), which began at No. 33 Reed Pond Walk, but which in about 1928 moved to Balgores Lane, near to Gidea Park station (about where the corner of Chalforde Gardens is now). That, however, became Belmont House school (after the building in which was housed) which doesn't correspond with the name on the sign.²

Or it might be neither of these. If you are able to shed any light on this, then please do let me know.

¹ Victoria History of the County of Essex, volume VII, page 95.
² Information from Miss Knight's by Gwen Redgrave, Romford Record No. 11 (1979).