Hello dear aspirant

Hope you’re doing well

I guess you belong to general category as you havent mentioned otherwise.
to get admission in B.Sc biology honours, university of Delhi considers aggregate of PCB.
and the cut off goes quite high, its very unlikely for you to get biology hons with 85% aggregate of PCB.

You can still try to look for colleges in 5-6cut off.

Also i suggest you to keep other back up options ready

Also you can try using DU college predictor tool.
I am attaching the link below

https://university.careers360.com/delhi-university-college-predictor?utm_soource=qna&utm_medium=du_cp

Good luck