Hey.

To be eligible to take admission in DTU you must secure at least 60% aggregate marks or more in Physics, Chemistry and Mathematics at Senior School Certificate Examination Level/XII. And you must also pass English subject. You must also pass each of these subjects individually.

Considering that you have passed all subjects individually, but your aggregate of PCM is 59% after improvement, you don't seem to be eligible for DU as you do not qualify the minimum 60% aggregate criteria.

Best of luck