I think k-9 and k-12 are terms used in education. k is for kindergarten. What about 9 and 12? Do they refer to ages? or grades?
We use primary education for the first eight years (ages btw 7-15);secondary education for the next 3 years (high school) and higher education for university.
What is the equivalent of k-9 and k-12 in the above system?
K 12 is the whole of the eductaion from kindergarten to 12th grade (end of secondary)