Trusts running academies in Norfolk and Waveney have ranked among the 10 best and worst for GCSE results nationally.
The Department for Education released performance data for the country's multi-academy trusts (MATs) on Thursday morning, for GCSE results and primary school tests.
Though Norfolk and Waveney have dozens of trusts, the data only includes those who have at least three schools with exam results in 2016/17 who have been with the MAT for at least three years.
In the secondary school section, the Inspiration Trust, which has 14 schools in Norfolk and north Suffolk, ranked second highest in the country for Progress 8 - a measure of how much progress pupils make.
Roughly, a score of zero means pupils do, on average, as well as other pupils who performed similarly at the end of primary school. A score below or above means they made less or more progress.
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It scored 0.55 for 2016/17's GCSEs, second only to the Thinking Schools Academy Trust's 0.68.
It was closely followed by the Seckford Foundation Free Schools Trust, which runs Beccles Free School, with a score of 0.45.
Elsewhere, the Eastern Multi-Academy Trust, which runs schools including King's Lynn Academy, scored -0.5, putting it in the bottom 10 of secondary MATs across the country.
The Transforming Education in Norfolk (TEN) Group, which runs schools including Attleborough Academy and Wayland Academy in Watton, scored -0.34.
Ormiston Academies Trust's Progress 8 score was -0.04 - covering 25 schools across the country - while Creative Education Trust, which has schools in both Norfolk and the Midlands, scored 0.05.
The Academy Transformation Trust, which runs Nicholas Hamond Academy in Swaffham and Iceni Academy in Methwold among others, scored 0.06.
Rachel de Souza, Inspiration Trust chief executive, said: 'It is a brilliant accolade for our pupils and staff to have the Inspiration Trust once again recognised as the best non-selective schools group in the country, in the second set of these official figures.
'Everyone in our schools works incredibly hard, and that hard work means more pupils in Norfolk and Suffolk getting good grades and a better start in life.'
Primary
At primary level, a trust with schools in Norfolk has been rated as one of the top-performing providers in the country.
Ormiston Academies Trust was rated fifth for primary school performance out of 153 multi-academy trusts.
It runs Ormiston Herman Academy and Edward Worlledge Primary, in Great Yarmouth, as well as several secondary academies in the region.
Its overall progress score across reading, writing and maths was 3.4, one of the highest results in the country.
Nick Hudson, its chief executive, said: 'OAT's primary offer is very strong – and is borne out by today's rankings. We are delighted that the hard work and expertise of our primary school teachers and leaders are officially recognised as so outstanding.'
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