As per a article published in Times of India it was proposed to UGC to give admission in DU based on CUCET. But after that no such updates are available for the admission to the DU University. So CUCET score upto now isn't applicable for DU. For DU you have to appear for DUET.

To know more about CUCET you may visit the link below:

https://university.careers360.com/articles/cucet

For the TOI article visit the link below:

https://timesofindia.indiatimes.com/home/education/news/du-entry-combined-score-of-entrance-and-class-xii-may-count/articleshow/81161281.cms

For DUET visit the link provided below:

https://www.careers360.com/exams/duet

I hope my answer helps. All the very best for your future endeavors!