This was all tried in the 1960s (e.g. in Leicestershire) as a parallel experiment to comprehensives. No-one liked it, it didn't really work.
Sam FreedmanNew post just out: "Burnham's first mistake" Splitting 14 year olds into academic and vocational paths seems intuitive. But it's a terrible idea that risks increasing inequality, and closing down options for the young people that need them most. (£/free trial) open.substack.com/pub/samf/p/b...