Here's an absolutely fascinating blog from Education Datalab that shows that the standard of maths capability required to get a pass (C/4) has been dropping for over a decade. This includes the massive curriculum upheaval implemented under Gove in order to raise standards. ffteducationdatalab.org.uk/2021/03/has-a-gcse-grade-c-4-lost-its-value
It has been a concern for a while that the comparative outcomes method of maintaining the proportion of students passing GCSE maths could actually conceal issues in secondary education. How would we be able to tell if standards were declining due to the critical shortage of maths teachers and increasing class sizes if the same proportion of students were guaranteed to pass their GCSE each year? PISA scores have been trumpeted as showing an improving picture inews.co.uk/news/education/pisa-test-results-2019-rankings-england-education-england-scores-maths-370158
What Education Datalab have done, therefore, is select out the students sitting the PISA test who passed their maths GCSE with a C/4 and compared their PISA scores over the years. It's clear that students who get a C/4 have been getting lower and lower PISA scores as time has gone on even as the England average has increased.
We obviously had large grade inflation last year due to the 'best of algorithm or teacher assessment' approach, and this year is likely to see similar.
What will happen in future years to recalibrate? A fall in the pass rate will not be accepted by the public therefore dangerous for a government to implement - that's why the idea of making a grade 5 the pass for the league tables was dropped.
And how can we really tell if standards are falling? The national reference tests (2nd graph) are not particularly thorough and don't tease out the students performing at pass grade level.
What is going to set the standard in future years? A return to pre-pandemic pass rates and the assumption that students' education hasn't been affected? Do we need GCSE grade 4 to actually represent a standard of achievement?