Hello,

The eligibility criteria to enter NCC is Graduation. Marks of all the years and minimum of 'B' Grade in 'C' Certificate Exam of NCC is needed.

Yes, you can join NCC, you need to be a registered student of a college, as a postgraduate student. Graduation is mostly preferred.
Selection Process is based on Physical Fitness Standards at OTAPhysical Standards and Visual Standards etc.

Follow the given link

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.careers360.com/question-how-to-join-ncc-in-graduation-and-traning-schedule-in-ncc/amp&ved=2ahUKEwil6pn19Yv1AhXr6XMBHRmBC5YQFnoECC0QAQ&usg=AOvVaw06voHu8ytJx0TNjlmlBgyT

Hope this is clear

Thanks