My son is a FT grad student, but for less that 4 month ea (2018 an 2019) semester. Is there a way to combine both semesters to change him to FT student status?

I’m trying to come to terms with my son’s status as both a dependent and as a student. After a year off from graduating college he enrolled in a 1-year masters program in Australia. Both semesters are a little shy of 4 months, which does not meet the 5-month rule to be considered a student. Is there a way to combine both semesters to change him to student status?