Summary SATs results that had been released this morning have been taken down from government website after an error was reported, TES has reported.
Pupils who were working below the level of the tests had not been included in the calculations - giving a higher overall score than expected.
Head teachers have said that the summary figures did not match the individual pupil data.
The results were published on the NCA (National Curriculum Assessment) Tools site and have now been taken down.
Headteachers were able to access their results from 7.30am today, the national results were published at 9.30am.
However, some schools were able to see their own results for a short time on Friday following another error.
The national results revealed that 64 per cent of Year 6 pupils reached the expected standard in reading, writing and maths this year, up from 61 per cent last year.
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