the
graduation rate cohort for each public school district shall consist of those students who first enrolled in grade 9
anywhere three school
years previously or, if an ungraded student with a disability, first attained the age of 17 three school
years previously, and who have spent at least five consecutive months, not including July and August, in the district since first entering grade 9 and whose last enrollment in the district did not end because of transfer to another district, death, court - ordered transfer, or leaving the United States.