MCA(Master of Computer Application ) duration in DU(Delhi University), JNU(Jawaharlal Nehru University ) and BHU(Banaras Hindu University ) is 3 years(total 6 semesters),this course can be done after BCA(Bachelors of Computer Application).

Admission in DU for MCA is done through a exam conducted by NTA called DU MCA every year.

Admission in JNU for MCA is done through a exam conducted by NTA called JNU MCA every year.

Admission in BHU for MCA is done through a exam conducted by NTA called BHU MCA Postgraduate Entrance(PET).

For more details visit

https://www.careers360.com/courses/mca-master-of-computer-applications

Hope this helps.