Usually it is 2 years but there are some universities which give admission in 3 year programme. So, this depends entirely upon the university in which you are seeking admission.  To take admission you need to qualify entrance exam such as:All India Common Entrance Test (AICET) ,IPU-MCA-CET Lovely Professional University (LPU-NEST) ,GGSIPUS,  SMUET, BIT MCA, JNU MCA, NIT MCA COMMON ENTRANCE TEST (NIMCET) PUNE UNIVERSITY MCA,WEST BENGAL JOINT ENTRANCE EXAM MCA (WB-JECA), JOINT ADMISSION TEST FOR MCA/ MSc (IIT JAM),NMU PGSET, IPU CET, PGCAP 

Hello,

 MCA is generally a three-year course. If you have done BCA or some other similar course you can get admissions directly in the 2nd year of MCA. This is known as the lateral entry. It all depends upon the norms of the university through which you want to pursue MCA.

Hope this helps!

All the Best