hi,

see one year gap is allowed and it will not be a problem for you to admission in colleges under delhi university.

however there is almost 80+ colleges is under delhi university and cutoff score changes every year as per questions difficulty level, seat matrix, number of participants, students category, choice of course etc. eligibility criteria may differ course to to course, for ba course except economics admission is based on 12th score. for ba HONS  in economics you need to appear in DUJAT EXAM.