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.
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The Plaid leader urged voters to give her party a mandate, so that she can give Wales a voice in Parliament as the SNP has for Scotland.
90,000 people are expected to attend the youth festival, which runs from the 29th May to the 3rd June.
Heavy, thundery showers will clear northwards through the morning, allowing it to turn mostly dry and bright for many.