Moving Kids to Portugal and Study Here

Hi my kids are 7 and 11 years old. They don’t know Portuguese yet. In this age range, is it difficult for them to study in Portugal? Is it a must to choose international school in English stream? (though English is not their mother language but they are able to speak and understand it).

What’s the education system in portugal? Do they go abroad when they study in University?

As far I know friends of mine his children admitted in English midum but very expensive euro 700.00 per month has to pay… But lots of option you have it.