Let the school know you're thinking of applying — they can share their prerequisites and help you through the process.
It's best to ask — circumstances can change at any time.
Okinawa International School (OIS) opened in April 2003 and provides education from preschool through high school across its programs. OIS is an IB Continuum School. It became authorized for IB PYP (2011), IB MYP (2016) and IB DP (2020), making it Okinawa’s first and only school offering the full IB pathway. In the elementary years, students learn through the IB PYP approach and complete a PYP Exhibition, presenting inquiry learning. OIS also highlights a local-language element in elementary school by offering “しまくとぅば” (Okinawan language) classes. At high school level, OIS offers an IB course and an additional International Liberal Arts (ILA) course option.