We need to start by designing a European framework in which all the countries participate. If all the European countries participate is easier that they are willing to apply this framework in their educational curriculum.
Once all countries are willing to follow the same path, it is easier to implement the 21st century skills and promote international projects, such as exchanges. Afterwards, teachers need to do some kind of training in order to fully understand what the 21st century skills are and what involves. Then when all the educational community is committed, schools need to change such aspects as schedule, methodology or assessment.
In my opinion, all those changes have to be done step by step. If we want to change all at time, we are going to end up with a huge mess. Schools need to try to innovate and then evaluate if the changes were positive or negative.
If a school wants to start to reform the education they are offering, a good start is the spider web of van den Akker. It gives you a clear picture of the aspects that are involved in education and helps you keep track of the progress that you are making.
By setting the same goals for all students around Europe, students are going to be able to move around Europe and this would be help them to see the reality of Europe.
It is not the same that a teacher explains you something about a country, than going to that country, speaking with the citizens and getting to know the country from the experiences of its own citizens.
Students need to see the world in order to be able to understand how the world rules.
I believe that it would help to understand that we live in a plural world where everyone is different, but at the same time, we all share common things like a culture, a routine, beliefs, thoughts, feelings, etc.
It would help to value our identity as individuals, but also help to appreciate the traits that we share as we share a community identity.