IB generally changes its syllabus roughly every 7 years. For mathematics, the current curriculum that is separated into AA and AI started in May 2020 - which means the first assessment was in May 2021 - hence it is expected to change in May 2027.
The availability of the classes may depend on the number of students who wish to enroll in or qualify for taking that specific class.
SJS follows a minimum of 5 students requirement for a class to be created.