Wales' Shadow Minister for Education has criticised the Welsh Government as 'a barrier to the success of young people in schools' following a major review into the education system here.
The National Union of Teachers in Wales says a report into the education system in Wales "will need to be digested fully in time."
The Organisation for Economic Co-Operation and Development found the Welsh Government "lacks a long-term vision" for the school system.
Plaid Cymru Shadow Education Minister, Simon Thomas, has called for the Welsh Government to "end the blame game" for education in Wales, after another international report found failings in the education system.
A major review from the Organisation for Economic Co-Operation and Development says the Welsh Government "lacks a long-term vision" for the school system.
The OECD's review praises the schools system here and its basic infrastructure, but says teachers and headteachers should receive more support.
- Schools - "Schools offer positive learning environments with good teacher-student relations and classrooms conducive to learning"
- Teaching - Recommendations include: "Raise the status of the profession and commit to initial teacher training" and "ensure quality continuous professional development"
- Low achievers - "A high proportion of low performers, with schools unable to respond to the learning needs of all their students" - it recommends: "Welsh schools need to move towards more personalised learning"
- Reforms - Recent "far-reaching" reforms such as the National Literacy and Numeracy Framework and Reading and Numeracy Tests for students in Years 2 to 9 - "the pace of reform has been high, sometimes too high", evidence of "the profession feeling increasingly overwhelmed by the high pace of change"
Recommendations also include ensuring Estyn inspections and the controversial secondary school 'banding' system "have greater coherence."
"Consider making the school banding calculation method more transparent, reducing the frequency with which schools are banded and judging schools on mutually agreed criteria for quality."
Independent education consultant Terry Mackie argues that the key theme from today's report from the OECD, and what should now become a focus for the Welsh Government, is the need to improve how schools support low-achieving pupils.
"It is beyond dispute that Wales has not met the diverse learning needs of all students," he said.
Mr Mackie describes the problem as "fixable", and says there needs to be "differentiating" teaching for individual pupils, intervening where they need extra support.
The Welsh Government says the OECD's report shows that "the direction of travel we've set is the right one" in terms of improving education in Wales.
Education Minister Huw Lewis said he takes on board a number of recommendations - and that the call for a smaller number of long-term objectives is "sound."
An international review has criticised the Welsh Government's handling of the schools system here, saying it "lacks a compelling and long-term vision to steer its reform efforts."
The Organisation for Economic Co-Operation and Development (OECD), which is behind the influential PISA rankings, says that the speed of reforms made in recent years "has been high, sometimes too high", leading to teachers "feeling increasingly overwhelmed".
It calls for a clear, longer-term strategy from the Welsh Government, with a reduced number of priorities.
Questions are also raised over the new model of regional consortia for driving school progress - with today's report saying "the school improvement infrastructure is underdeveloped and lacks a clear implementation strategy."
The OECD says Wales should focus on the basics - improving teaching standards by raising the status of the profession, and supplying better training - and providing more personalised learning for a high number of low achievers.
It also recommends changes to the controversial secondary school 'banding' system.
The report was commissioned by the Welsh Government in 2012 to assess education standards, and make recommendations for improvement.
Pupils sat the last set of so-called PISA tests in December 2012, and the results were published in December 2013 - with Wales ranked 43rd out of 68 countries for maths, 41st for reading and 36th for science - all lower positions than three years previously.