How can the education system in Spain be improved?

I’m interested in getting an outsider’s take on this question.

Every time there is an OECD survey, Spain, the 7th or 8th largest economy in the world always comes really low down in the ranking. In attainment in reading, science and mathematics. We are constantly down in the 20′s ranks near Greece, Portugal and Italy.

Every new government seems to want to change the education policy of the previous one and in addition regional politicians openly defy national government policy if they happen to be of another political party.

We have the money to have a much better education system, so why don’t we?

Honestly? Voting another Party on the next elections. But even so I think it’s not possible to improve it rapidly. In fact, Spanish politics are rubbish! (whatever Party!). I’ve graduated on the University recently but I don’t think I’m trained at all. I think that the knowledge that the University teaches is not enough. The case of the elementary school and High School is even worse! It’s sad! I’m not particularly proud of that, what a pity!