You need to pass your graduate exam from University of Delhi or an equivalent University for DU LLB. General Category Students should score at least 50% marks in the qualifying exam and OBC,SC,ST students should score atleast 40%. The exam dates are between 2nd and 9th July. If you are in your 5th semester now, you still have to wait because you have still more than 6 months to complete the course. You should be able to complete the course atleast by the time of admission. But in your case, you will not be able to complete your B.Com and so you cannot write DU LLB this session.