Hello student. Usually every deemed university will have a deadline to pay the semester fees. In the first year, you need to pay immediately soon you join after you get the seat. For all the years, you need to pay before the start of next semester.

As in, if 1st semester starts from June. For this you need to pay at the join of sem. This sem ends at November mid and next sem starts on December mid, then by the end of the November you are supposed to pay the fees