International primary and secondary education. Rivers International School Arnhem (RISA) offers students a high quality education in an international, multi-cultural setting, according to IBO standards. IB-Diploma Programme for Dutch students from 5 Havo or 4 VWO Via Rivers International School Arnhem naar Oxford of Harvard The Dutch Ministry of Education, has decided that Dutch students who do not fulfill the normal expat requirements for admittance to Arnhem International School can now join the IB-DP programme.