Re how well Graveney serves its non -selective stream students this analysis was on a thread from last year and is enlightening...
From the DOE Performance Tables:
Demography / intake:
Graveney: Low attainers 9%
Middle Attainers 38%
High Attainers 53%
Dunraven: Low attainers: 13%
Middle Attainers: 54%
High Attainers: 26%
So, Graveney has more than twice as many high attainers but both schools have the same % of pupils getting 5 GCSE A-C inc Eng&Maths with 75% for 2013.
Comparing like for like (i.e attainer group against attainer group) the % getting 5GCSE inc maths and Eng:
Graveney - middle attainers: 63%
high attainers: 96%
Dunrave-: middle attainers: 76%
high attainers: 98%
Average score per qualification:
Graveney- High Attainers:A-
Middle Attainers: C+
Dunraven -High Attainers: B+
Middle Attainers: C+
So, on this comparator Graveney gets a slightly better score for it's high attainers - but those high attainers represent a super-selective intake. It gets the same score for middle attainers, where you would expect the groups to be more comparable.
So, if you remove the impact of the super-selective stream, the two schools results are broadly equal.