Here’s what you should do:

1. Check Cutoff Trends : Look at previous years’ cutoff marks and ranks for the B.Sc. Mathematics program at DDU to see if your score is within the acceptable range.
   
   

2. Contact the University : Reach out to the admissions office of DDU or check their official website for the most current and accurate information regarding cutoffs and admission criteria.
   
   

3. Prepare for Counseling : If DDU conducts counseling or interviews as part of the admission process, be prepared to participate in those.

Your rank of 255 is competitive, so you have a strong chance, but always confirm with the latest information from the university.

I hope this answer helps you. If you have more queries then feel free to share your questions with us we will be happy to assist you.

Thank you and wishing you all the best for your bright future.