Dear student,

You can do BCA as of now as you've only passed out 12th

To take admission, the minimum BCA eligibility is atleast  50% in Class 12 with English as a mandatory subject. Admission is mostly done through entrance examinations like IPU CET, but many colleges like IITM New Delhi take admission based on merit

As you fulfill the eligibility criteria you can surely pursue BCA and later MCA if you wish to.

Hope this helps