Hello Aman,

DU offers two BCom courses, one is BCom Hons. and another one is BCom Programme. First of all, I'm assuming that 80% is your best of four score, and not the overall score of all the five or six subjects, because DU considers the best of four scores for the admission cutoffs.
For BCom Hons, the chances of getting an admission in any college with 80% are almost negligible, if you're a General category student. However, if you come from a different category, I believe you can get into a decent college with that score.
For BCom Programme, the cutoffs are usually lower than BCom Hons. by at at least 24% for every college. So you have a better chance of getting into a regular college for BCom Programme than BCom Hons, if you're a General category student. However, if you come from a different category, although you'll get a college for BCom Hons as well, you'll definitely get a much better college for BCom Programme with that score because of the obvious reason of lower cutoffs for BCom Programme. That's when you'll have to make the Course vs College decision.
However, you can also try to apply through the ECA quota, if you feel you have a special talent like singing, dancing, etc. Every college has a different criteria for admissions through ECA, so you need to check that accordingly.