Hello dear

The opening closing ranks depend upon various factors and they change according to these factors. If there is any vacancy left in the particular branch, then the closing rank will shift accordingly. As in any branch in any college  which is ranked higher than NIT surathkal civil and has vacancy, and if any aspirant who is getting civil in Surathkal  wishes to choose that one, he/she will get it according to the rank. And thus there will vacancy in civil. Thus the closing ranks will change. This usually happens in the last rounds, specifically 7th.

I hope this helps. Feel free to ask any other queries.