The best and worst-performing secondary schools in Sutton and Croydon have been revealed.

Results based on GCSE exams taken by Year 11 pupils in 2016 have been published by the Department for Education (DfE).

Previously a school’s performance would be determined by the number of pupils achieving at least five A*- C grades, including English and mathematics at GCSE.

But from 2016 the Government is using Attainment 8, Progress 8 and qualifications in English and mathematics to grade schools on their performance.

What is Attainment 8?

This measures the achievement of a pupil across eight subjects including maths and English, which are both double weighted, and three subjects that count in the English Baccalaureate (EBacc).

These subjects include history, geography, information technology, the sciences and languages.

The further three subjects that go towards the Attainment 8 total are pulled from GCSE qualifications, or technical awards chosen by the pupil.

What is Progress 8?

This is the score that shows how much progress pupils in their school made from the end of primary school to the completion of their GCSEs and is compared to pupils across the country who received similar results at the end of Year 6.

It is based on results in the eight qualifications as mentioned above.

The results reveal whether, as a group, pupils in the school made above or below average progress compared to pupils on a similar level in other schools.

• A score of zero means pupils achieved about the same level as other pupils in other schools who got similar results at the end of key stage 2.

• A score above zero means the child made more progress, on average, than pupils across the country who got similar results at the end of key stage 2.

• A score below zero means pupils made less progress, on average, than other students who got similar results at the end of key stage 2.

However, a score below zero does not mean children made no progress, or that the school has failed, but does mean pupils did make less progress between Year 6 and Year 11 when measured against other students.

How did local schools do?

Nonsuch High School for Girls and The Harris Academy, in Sutton and Croydon respectively, came top of the tables based on progress made by pupils.

However, Beckmead in Croydon and Sutton’s Wandle Valley School were the worst performing schools based on the same measurements.