Schools in Sutton will be affected as teachers go on strike over pay, pensions and workload.
The strike, organised by the National Union of Teachers (NUT) is set to cause disruption at some, but not all, Sutton's schools tomorrow.
Stanley Park High School is set to close completely while many others are partially closed with teachers and support staff joining the pickets.
NUT general secretary Christine Blower said: "Teachers deeply regret the disruption caused by this strike action to parents and teachers.
"The Government’s refusal, however, to engage to resolve the dispute means that we have no alternative other than to demonstrate the seriousness of our concerns."
Schools that have confirmed they will remain completely open are:
Spencer nursery school,
Thomas Wall nursery school,
High View primary school,
Manor Park primary school,
Dorchester primary school,
Robin Hood primary school,
Culvers House primary school
Bandon Hill primary school.
The following schools will be part open:
Bandon Hill primary school
Barrow Hedges primary school
Tweeddale primary school
Avenue primary school
Cheam Common infants' school
Cheam Fields primary school
Green Wrythe primary school
Hackbridge primary school
Beddington Park primary school
Devonshire primary school
Brookfield primary school
Robin Hood infants' school
Muschamp primary school and language opportunity base
All Saints Benhilton CofE primary school
St Mary's RC junior school
All Saints Carshalton Church of England primary school
All other schools have not confirmed how they will be affected.
For more information, visit schools' websites.