Teachers in the NUT union took a second day of solid strike action at Norlington Boys school in Leyton, east London, on Wednesday of last week.
The teachers also held a march through Walthamstow market on the day of the strike.
They are fighting plans to close the school and merge it with five other schools in the area to form two trust schools.
Teachers argue that this would lead to a lower quality of education for children, worse terms and conditions for workers and would remove the schools from local authority control.
A governing body controlled by the Institute of Education (IOE) would run the proposed Trust. But the UCU lecturers’ union, whose members work at the IOE, is also opposed to the plan.
Teachers in the NUT union at Haggerston school in Hackney, east London, struck on Tuesday and Thursday of last week against compulsory redundancies.