It's very nice to hear that you want to join the International Business programme. However, according to the admission and entry requirements page (https://www.saxion.edu/studying-in-the-netherlands/application/admission-and-entry-requirements ), you would need at least a 6.0 on your IELTS in order to qualify for the programme and Duolingo is usually not counted as a certification. But to be sure, feel free to reach out to the International Office
via firstname.lastname@example.org and they should be able to tell you more.
Good luck! In case you have any other questions, feel free to reach out.