Carlisle's Richard Rose Central Academy has been placed into special measures for the second time in four years.
Inspectors say standards at the school are unacceptable. Pupil achievement and quality of teaching were criticised.
The school was last put into special measures in early 2009, just months after it opened.
Governors have written to parents to say they will respond to the issues quickly and effectively. They appointed a new executive principal to try and tackle the concerns.
"I am very angry. Millions of taxpayers money has been thrown at it but some big questions have still not been answered.
"We so wanted to have a voice on the governing body but we never succeeded.
"There are generations of children that are going to be affected by this because, in my opinion, they have lost out on an education."
"Open plan classrooms mean people can't deliver lessons effectively. There's a high staff turnover.
"At the end of the day, the school has turned out to be one big political experiment that's played fast and loose with the lives of young people in this city and their dedicated teachers."
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