Teachers at The Kimberley School in Nottingham are going on strike for an eighth day over plans to turn it into an academy.
They say the move is not in pupils' best interests, but the headteacher says it makes financial sense.
Governors at the Kimberley School have rejected an offer by the National Union of Teachers to hold talks about their plans to become an academy in return for suspending further action.
However, the governing body have said there is no middle ground as the school believes the financial benefit from becoming an academy is a great opportunity.
They fear any delay could jeopardise their plans to convert in September.
Union officials say the action is part of a wider anti-academy campaign in Nottinghamshire, they are concerned about possible changes to their terms and conditions.