HTH Naomi ;c)
Pearson is a pretty recognised research organisation their methodology is defined here:
http://thelearningcurve.pearson.com/the-report/appendix-1
It's certainly more rigorous than looking at personal experience from one or two schools and rumour.
Remember too this is over the whole country so the private sector ios included in these figures (If that makes anybody feel more politically comfortable).
And No OG - I don't think we should be satisfied either there's plenty of scope for improvement.
We may be beating France and Germany and Australia and the US but we've a long way to catch up with the Asian countries.
Personally I think the big differentiator there is the value that education is given - particularly in maths.
I'm constantly shocked by people who openly admit to being bad at maths often people who are very quick to criticise the grammar or spelling of others!
People who think of others as Boffins or Nerds
These are attitudes that I suspect would be totally amazing in places like South Korea