No mixed ability teaching on our comp. and the teachers are currently working tirelessly to encourage work ethic amongst all abilities.
They run workshops to promote resilience, and teach kids how to organise and manage themselves.
Throughout Yr 11 they have run after school revision clubs, had kids in over the Easter hols, are running past paper sessions this half term, inviting kids in for no-uniform
revision sessions, meeting parents etc etc. They do all this unpaid, of course. And there is a very high take-up, across all abilities.
A lot of kids come from homes where there is not a quiet revision space (our borough has very high stats for overcrowding in housing). The school encourages use of the school library, and makes an arrangement with the local high street library, working in partnership to ensure quiet revision space at the right time of the year.
This comp gets very good results, raw and VA, across all abilities.
I know 3, 4 if you count faith comps, comps in our area that operate like this.
Let's put our energies into supporting (and funding ) all comps to be good schools.