Help needed in finding international school for kids 10,13 and 16

Hello all:). I am moving to Norway in May 2017 with my three children aged 10,13 and 16. I have tried to find a school for them, but have so far found one only for the youngest one ( the Northern Lights in Oslo). Which school do the older expat children attend? One with english (or finnish) as teaching language would be preferred. Thank you so much for all help:)

I think there is an international school in Bærum area for older kids.  Its the same school that the crown princess goes to.

http://www.oslointernationalschool.no/

Thank you 😊.