I have been wondering - based on this case but also a recent Home Ed thread on which it was stated that some schools are encouraging parents to withdraw children with SEN to home ed to avoid them appearing on GCSE statistics, and also that liaison between mainstream and Special schools is poor - whether there should be a change to when / if schools can remove children from their roll.
So for example, in my plan a school that admits a child to its 6th form commits, at that point, to have that pupil appear on their Year 13 results. If the child gets poor Year 12 results, and the decision is taken for them to move to another school/ college to take BTECs, then those results still appear on the first school's statistics. Equally if the pupil ends up in the hospital education system, a Special school, a PRU, prison,. drops out entirely - all of those appear on their statistics. Possibly in a section headed 'pupils not attending the school but registered there at end Y13', or something, but must be included in the headline results. A little bit like some secondaries currently use 'off site provision' for some pupils - perhaps to offer a wider range of vocational courses than are economically provided on site - but those results still appear on the 'home' school's statistics.
Equally, schools that admit pupils for GCSE courses (I am in two minds about when this would start, as I don't want there to be a 'cull' at 13 - perhaps it should just be 'pupils who are admitted to the school at 11 or following a move of location') could be held accountable for that child's results at 16. It would force much greater links between Special Schools, PRUs, alternative education placements etc and the 'home' school, which can only be a good thing, but also stop covert 'weeding out' of some pupils who might affect results, because they would still 'appear'... and perhaps encourage schools to really eliminate bullying or lack of suitable SEN provision, because if a child moves schools as a result of bullying, then the original school remains responsible for their results.
Obviously there would have to be some mechanism to transfer 'home' school under limited circumstances such as a genuine house move, and there might be circumstances in which a child's results are 'counted' in two places (as it seems wrong to prevent a school or college 'receiving' a BTeC student, who then does very well, from having those results on their data). however, i do think that something needs to be done to make schools responsible for any pupils who they 'manage out' in order to massage their figures.