Hello. As per recent changes in eligibility criteria for NATA, currently there is no provision for diploma students for giving NATA 2019 unless any other official notice is released for diploma students.

The current eligibility criteria is that the candidate must have passed 10+2 with minimum 50% in Physics, Chemistry and Maths and in aggregate.

But CoA has written a letter to MHRD for including diploma students in the eligibility criteria too.

For further information check the below link.

https://www.google.com/amp/s/engineering.careers360.com/articles/nata-eligibility-criteria/amp

Hope this helps. Good luck!