Children are scared to go to a school run like a "military boot camp" because of a teacher known for his strictness, a parent claims.
Stowupland High School brought in Barry Smith after a "requires improvement" Ofsted rating in December.
But one parent said others were thinking of moving their children due to Mr Smith's appointment.
The John Milton Academy Trust, which runs the school, said Mr Smith was supporting staff.
Mr Smith was previously the head teacher at Great Yarmouth Charter Academy, and was known for "army like" strictness which was criticised by some parents.
He introduced a 22-page rules guide - which included setting a 21:30 bedtime.
During Mr Smith's tenure, the Norfolk school - rated "inadequate" by Ofsted in April 2016 - was judged to be "good" in July 2019.
During an Ofsted inspection in December inspectors found pupils at Stowupland High School were "unsettled" and their behaviour had been affected.
Parts of the school are also closed due to the presence of Raac, which has led to parts of the site being closed.
