Greetings, aspirant!

I'm afraid NID, Ahmedabad does not offer any diploma courses. The courses offered by NID are Bachelor's level (B.Des) and Master's level (M.Des)

NID offers a Graduate Diploma that invovles a 2 semester foundation programme followed by 3 years of specialization studies. The duration of this course is 4 years, the same as B.Des.

To get an admission into these courses, an applicant needs to appear for the Entrance exam conducted by NID.

The basic eligibility criteria is that the candidate must be below the age of 20 before applying for B.Des and must have finished their 10+2 from a recognised board in any discipline

You can learn more about NID by clicking on the link below

https://www.careers360.com/university/national-institute-of-design-ahmedabad

Hope this information helps

Best of luck