More money! Lower the standards and give teachers more money I say! 

The low scores actually make sense when you look at the bigger picture here. 
(The answer is a 5,000 page essay on Globalization)

But dig this. 

The Future: 

1) Artificial Intelligence taking over many jobs. 
2) Universal Basic Income (UBI). 
3) Robots will be doing many menial jobs. 
4) Lesser intellectual diversity among all teachers: 85% of them vote for the same people. 
5) Illegal and H1B immigrants attacking wages from the top and bottom

Where is this going? Who is pushing this? It's not us normal people that's for sure. Of course it's all 'just a theory' ...  until it starts happening. And it is happening. Google: UBI Finland. It serves the political class to keep our kids dumbed down so they don't realise how shafted they are going to be in the future. The days of just walking into a job (of your liking) may be over. 

You will find your job on a list of "community needs" when you collect your UBI.