after bca,mca duration in Delhi University ,JNU AND BHU
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.