What determines a college's closing rank
Closing rank is a result, not a fixed target — it emerges from how many candidates choose that college/course combination relative to seats available, for each category and quota, in each round. It naturally shifts between rounds as candidates upgrade out of earlier allotments.
Comparing closing ranks across years is only meaningful when normalised for total candidates and exam difficulty that year — a raw rank number from a previous year is not directly transferable to a different year's exam.