Hii Harshit!
As per the last year cut-offs, for pursuing Bsc. Mathematics or Hons, it was 80- 85% minimum for general category. The cut-offs vary every year. In general more than 90% is required as a whole to get into DU.  But, don't feel bad, you may have a chance. The courses including mathematics provided in DU are bcom,  bsc , Mathematics hons,chem Hons, physics Hons, etc.,
For more information refer the following link -
https://www.google.com/amp/s/university.careers360.com/articles/du-cutoff/amp
Hope this helps.
Good luck!

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