Hello all,
I recommend the following publication,
published by the OECD :
Education at a Glance 2014
OECD Indicators
It can be read online for free.
Chart A9.5 for example shows the change between 2003
and 2013 in student performance and equity, based on
PISA score points.
According to this chart, Switzerland is doing well, even
though the performance of students has not improved
a lot, but not deteriorated.
Have a read by yourself !
Best,
Michael.