Will dtu give relaxation in class 12th exam marks for obc candidate

In DTU 85% of seats are reserved for students who have done their +2 from any of the recognised schools located in Delhi. And 15% for students from outside Delhi.
To apply for DTU, applicant must be between 17-25 years(Age relaxation for reserved categories is as per the norms of Govt of India).

Cut off marks will be calculated by giving 60% weightage to JEE Mains Score and 40% weightage to percentage obtained in 12th standard.

Yes, Jat is eligible for admission against OBC quota in DTU.
Relaxation for Reserved Categories:

1. Other Backward Class(OBC): There will be relaxation of 5% of marks for candidates of OBC category.
2. Defence Category(CW): There will be relaxation of 5% of marks for candidates of defence category.
3. SC and ST categories: There will be relaxation of 10% of marks for candidates of SC and ST categories.
4. Persons with Disabilities(PD): There will be relaxation of 10% of marks for candidates of PD category.

For detailed reservation quota and eligibility criteria, you can refer to the admission
brochure