Hello Aspirant,

As you have not mentioned the marks obtained in fourth subject so it is little bit difficult to calculate the best four percentage and hence it is not possible to help you with an accurate information without the percentage of candidate. However you can check out previous year's cut-off and expected cut-off for different colleges of Delhi University for B.Sc Hons. in Maths. Previous year's cut-offs are mentioned in the link given below :-

https://university.careers360.com/articles/du-cutoff

To have a list of all those colleges which you can get based upon your marks and category you can use DU College Predictor:-

https://university.careers360.com/delhi-university-college-predictor?icn=QnA&ici=qna_answer

I hope this information helps you.

Good Luck!!