Hello,
The admission to Delhi University for B.Sc. occurs on merit basis. If you are considering for admission to DU, then you should calculate the best four subjects' percentage and this is considered for admission. The best four includes one language, one relevant subject (Eg. Biology for B.Sc. in Botany, Zoology etc./ Physics for B.Sc. in physical sciences) plus two optional subjects.
Authorities release cut-off marks before each round of admission. If you have cut-off more than this, then you can go for admission. This cut-off varies from course to course and depends on caste, seat matrix etc. Top colleges have cut-off in the range of 95%. With 77% you won't be able to get into best colleges. You can check cut-off of previous year for various courses at http://www.du.ac.in/cut-off.html .
According to previous year cut-offs, with 77% you may get B.Sc. (Hons.) in Home science, biomedical science, physical sciences.
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