The Grange School in Shrewsbury put into special measures
A Shrewsbury school rated by inspectors as inadequate in every category has been placed into special measures.
The Grange secondary school was given the lowest rating in five categories, including overall effectiveness, after an Ofsted inspection.
Governors are proposing a formal federation with Sundorne school, which is rated as good by the education watchdog, Shropshire Council said.
It added governors at the Grange school accepted standards needed to be raised.
In the Ofsted report, the school was graded as inadequate in terms of achievement of pupils, quality of teaching, behaviour and safety of pupils, and leadership and management.
Teaching improvements were "too fragile and in many lessons the persistent low levels of disruption have a negative impact on the learning of students", the watchdog said.
The council said inspectors praised senior staff for their hard work ethic, noted attendance had improved and highlighted positive examples of good teaching, particularly in the performing arts.
The leadership and governors at the school "were already working on improvements" before the outcome of the inspection, the authority added.
In a statement released by the council, head teacher Julia Thomas said it already worked closely with the other school and a formal federation meant it would "benefit from Sundorne's strengths".
Under a federation, schools can have a joint governing body, share staff and resources to improve efficiency, and offer more choice of curriculum and support to pupils, the authority said.