According to the national archives, ref ED35/2576 The School formaly Known as Birmingham Municipal Technical Day School was called Sulfok Street Council secondary School.from 1902 untill 1919.
On the Aston Univercity website (The early years) It says The Birmingham Municipal Technical School only taught as an evening School as day release courses where not available untill 1919. in the day time it was used as a boys Shcool,There is a photo of the School,wich is the same photo as the one on Birmingham central Grammar Schools face book page.