To apply for the programme, you would need an IELTS test (6.0), good proficiency of mathematics, and a high school diploma that is recognized by Saxion. You do not need to do extra math classes, but you do need to show some kind of test result from school that shows you know it well, as far as I know. I cannot tell you exactly what you need to study in high school, however you can ask this question to our international office at firstname.lastname@example.org. In addition, here's the requirements for our programme as well: https://www.saxion.edu/programmes/bachelor/international-human-resource-management/requirements
Hope that helps you!