Hello Deepika,
 
  For pursuing BCA , the basic criteria remains 12th pass. Admissions are offered on the basis of merit.
If you have good academic score then you can go for government Colleges for pursuing BCA . There also priority will be given on the basis of merit.
   Go through the college website which ever you want to be in and check its process and registration dates you will have a clear view then.

Hope this will help.