Cut off will be decoared on the basis of only marks .

It doesn't depend upon the paper ( which you are talking that for many slots and days)

Because the difficulty level and your concept analysing methods is same for each and every slot.

So they combine the marks of all slots to make a single list and than they declared the cut offs depending upon the number of candidates and the marks above a criteria and the number of candidates they wanted to be allowed to sit in JEE advanced.

And you must know that your final rank will be based on the highest of your january and April exam which will come only after 2nd chance ( April exam).

i.e. I think you will get only your marks out of 360 on 31st of January you will not get rank at that time

So good luck