Two schools are tied neck and neck at the top of the tree when it comes to GCSE performance among grammar schools in the latest school league tables.
Queen Elizabeth's School in Barnet and Colchester County High School for Girls both achieved 100 per cent rates of students getting five A*-C/4-9 grades in the 2017-18 academic year.
They were by no means the only school to achieve this feat - in fact 46 schools matched it - but they come out ahead of the pack when ranked on a secondary measure.
Pupils at both schools made considerable progress when compared with students of similar prior ability at other schools. Both had a Progress 8 score of 1.22.
Our interactive league table allows you to peruse these latest rankings - for the academic year which finished in summer 2018 - and search among the 163 selective grammar schools in the Department for Education's data.
You can also:
- Search for the best independent schools for GCSE results
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Search for your school or town to find out where it ranks
While scores of grammar schools managed to get all of their students achieving over five top GCSES, only 14 managed to gain a Progress 8 measure greater than one.
The Progress 8 measure aims to capture the progress a pupil makes from the end of primary school to the end of key stage 4.
It is calculated for each pupil by comparing their Attainment 8 score (pupils' attainment across eight qualifications) with the average Attainment 8 scores of all pupils nationally who had a similar starting point.
A score of zero means that pupils on average do as well at key stage 4 as other pupils across England who got similar results at the end of key stage 2 - so a positive score means that their progress outpaced that of similar students who used to be at their level.
Changes in GCSE regime meant that a new numerical system was used to mark most subjects, something that is still being phased-in.
In an attempt to toughen up GCSEs, the new system uses grades one to nine, rather than from A* to G - with anything above a seven being level to anything above an A in the old system.
School places picker
Finding a good school place for your child can be a stressful experience, with parents often having to perform a balancing act between a school's performance and the probability of their child getting a place.
But new research from The Telegraph has revealed that, of the schools ranked as Outstanding in the country, there are still 918 primary schools and 104 secondary schools that were under-subscribed in 2019.
By entering your postcode into the tool below, you can not only find out the under-subscribed schools in your area, but also assess their Ofsted ratings to find the best, most realistic, school to apply to for your child.
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Note: Secondary schools have been ranked by the percentage of pupils achieving five or more A*-C/ 9-4 or equivalents including 9-4 in both English and mathematics GCSEs. If schools are tied on this metric, the Progress eight measure is used as a secondary ranking.