Almost 40% of primary school pupils in England failed to meet the Government's expected standard in reading, writing and maths, national SATs tests results show.
Figures released by the Department for Education showed 61% of pupils reached the expected standard in 2017, up from 53% in 2016.
This means 39% failed to reach the expected standard across all three subjects of reading, writing and maths this year.
More than half a million 11-year-olds across England took national curriculum tests, known as SATs, in May, with the results used in annual school league tables to assess a school's performance.
The figures show an improvement on last year in all areas with 71% of pupils meeting the expected standard in reading, compared with 66% last year, while 75% of pupils met the expected standard in maths, compared with 70% last year.
The expected standard in grammar, punctuation and spelling was met by 77% of pupils, compared with 73% last year, and 76% of pupils met the expected standard in writing, compared with 74% last year.
To reach the expected standard in all of reading, writing and maths, a pupil must achieve a scaled score of 100 or more in reading and mathematics tests and a teacher assessment outcome of "reaching the expected standard" or "working at a greater depth" in writing.
School standards minister Nick Gibb said: "Today's results show sustained progress in reading, writing and maths and are a testament to the hard work of teachers and pupils across England.
"Thanks to their commitment and our new knowledge-rich curriculum, thousands more children will arrive at secondary school having mastered the fundamentals of reading, writing and maths, giving them the best start in life."