Progress 8 aims to capture the progress a pupil makes from the end of primary school to the end of secondary school.
At the other end of the scale, five schools were rated as "below average" on Progress 8, including Priesthorpe School, which has now become an academy known as Co-Operative Academy Priesthorpe.
Progress 8 compares the progress pupils make over eight key subjects in schools across the country.
They measure a child's progress and their grades across eight subjects, from the end of primary school to the end of secondary school.
Many Banburyshire secondaries scored above the English state school average of 46.3, with Chipping Norton School getting the highest of 52.4.
Six Surrey schools however fell ' below average.'; among them are Ash Manor, Christ's College (Guildford) and Farnham Heath.
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Sir William Robertson Academy, in Welbourn, Lincolnshire, achieved a score of -0.33, down from -0.32.
In Buckinghamshire, out of 37 schools, six of those - 16.2 per cent - are now under-performing.
"We have achieved this whilst also doing well in the creative subjects and maintaining a full programme of extra-curricular activities so that our students have an excellent all-round education".
"We are incredibly proud of students for their hard work and achievements during our first ever GCSE results a year ago and we look forward to building on our success for the future". "Progress 8 score measures progress from year six to year 11 and we only have students from year 10 to 11".
Reformed GCSEs are graded 1 (low) to 9 (high).
"It is extremely unfair that more schools find themselves in this situation because of complex changes to the way in which this is calculated".
"Our message to the DfE, trust boards, governors and inspectors is to avoid leaping to judgement on the basis of these performance tables", he said.
One in eight of England's mainstream secondary schools were under-performing in 2017, according to new statistics released by the Department for Education (DfE). To put that into perspective, only 12% of schools in England fall within this bracket.
Schools Minister Nick Gibb highlighted a narrowing gulf between the results of rich and poor pupils.