Hello Aspirant,

See don't make yourself confused in these little things, it is very simple process of JEE-Advance in which there are two cut-offs among which one cut-off signifies the qualifying cut-off which means that if you clear this cut-off you will be eligible for admission to IITs but on the other hand the second cut-off category is for colleges which means that for particular college there is different cut-off rank and if you are under that rank then you can easily take admission through counselling in that particular college.

Now coming to the second part of your question, according to the percentile you have mentioned in the question your approximate rank for JEE-Main would be near about 65,000-70,000 (if you were talking about JEE-Main) and on the basis of this rank you can get JEC Industrial Engineering College but note that you have mentioned the closing rank of last year for this college and these ranks are known as cut-off ranks which are bound to change every year depending upon various factors.

You can use JEE-Main College Predictor tool to predict the college according to your percentile and category, link for the same is given below :-

I hope this information helps you.

Good Luck!!