Why did swanshurst school cease to be a grammar school?

Swanshurst School ceased to be a grammar school as a result of the reorganisation of secondary education in Birmingham in the 1970s. This was part of a nationwide move away from the selective grammar school system towards a comprehensive system, aiming for greater equality of educational opportunity. The specific details might involve local authority decisions regarding which schools would transition and how. Essentially, it wasn't a decision solely about Swanshurst itself, but a broader policy change affecting many grammar schools across the country.