I had heard that after completing Diploma then if we have to take degree then 12th is compulsory? Is it true?

No, it is not true. After completion of Diploma, you can directly start your graduations. As you complete Diploma. You will take admission in 2nd year of your graduation course.

Yes, class 12th class qualification is a necessary qualification required by any person in any sector of the economy. If a person wants to take a Bachelor's degree or a Master degree or in that case a Diploma too, minimum requirement is a class 12th qualification. Many of you may have been told that