Yes, definitely DTU i.e Delhi college of Engineering comes under PMSSS. As far as I know about the college fees if it is 1.66 lakhs then the remaining which is 1.66-1.25 = approx. 40k will have to be paid by you.
It may be possible that the college may not take the extra fees from pmsss students. It is up to the college. You can read the college review of DTU by a pmsss student from here. You can also ask him in the comment about your question.