I know that every data set has flaws, but I thought this table would be useful for people when looking at all aspects of a school.https://www.goodschoolsguide.co.uk/help ... tab_review
(I can't take credit for finding the link, someone else posted it on the gcse board.)
The table ranks grammar schools for their added value scores over 3 years (2012-2014) in relation to gcse results.
It's very easy to just order your school preferences according to which has the highest headline rate of A* (or similar) but actually looking at how much a school can help a child progress from where that child starts at age 11 is probably as important (if not more so?)
Anyway, out of 162 grammars Nonsuch comes in at 4, Wallington County Grammar at 5, Tiffin Girls 8, Wally girls 21, Sutton Grammar 25, Wilsons 34 and Tiffin Boys 44.
Of course, the higher the cohort at entry into that school, the harder it is to add value so that has to be taken into account as well