No you are not eligible in DU JAT because in the eligibility criteria its mentioned that the minimum marks requirement in 10+2 is 60% in aggregate of four subjects i.e., Mathematics, English and any two subject which are available in the list provided by the university (for the list you need to visit the link i will provide below).

As a result you have RT, so you aren't eligible for DU JAT 2021.

To know more about DU JAT 2021 and the subject list visit the link below:

https://bschool.careers360.com/articles/du-jat#DU-JAT-2021-Eligibility-Criteria

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