Hello Avinash!!
Du cut off varies each year depending upon the factors like number of seats and number of applicants. For Bsc(H) Zoology your best three marks are counted ie of PCB.
Cut offs are generally above 95% in good colleges likes ones in North campus the cut off goes down to around 80-85% for Bsc in Off campus colleges. Chances are very low below 80%. You can also check past year cut offs over the official website of DU.

I hope this helps you!!

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