Angry parents have formed an action group to try to halt plans to merge two grammar schools in Lincolnshire.
The county council revealed on Monday that they were considering plans to combine Boston Grammar School (BGS) and Boston High School for Girls.
But some parents have said they feel as if they are being "kept in the dark" about the merger plans.
County councillors said dwindling pupil numbers prompted the move to consider merging the schools.
'Shock and upset'
Deborah Evans, mother of two sons at BGS, has organised the Boston Grammar School Action Group.
"A lot of parents and their children who attend BGS are in shock and very upset.
"No parent had been informed of a possible merger and the school rushed out a letter - we feel the last in line to know," she said.
But Councillor Christine Talbot, from Lincolnshire County Council, said parents had been kept fully informed of the process so far.
"We did not release anything to the press until after parents had been informed so in fact it was a press release by the two schools and we only facilitated that."
She said because of falling demographics and birth rates, there were some pupils at the grammar schools who had not passed their required 11 plus exams and this needed to be addressed in the future.
A study has been commissioned to find the most suitable site for the merged schools.