Yes you can..you need to qualify certain exams if you want a seat in renowned colleges or university. You should have minimum 50% in 12th (any stream) to do BCA. Some colleges prefer students who have studied Mathematics till 12th class whereas there are some colleges which give admission to those who had opted Arts or Commerce. Best Universities for doing BCA are: Delhi University, Delhi, Lovely Professional University- Punjab , VIT University Tamilnadu, Jamia Millia Islamia University Delhi,NMIMS Mumbai, Anna University Tamil Nadu, University of Mumbai, University of Kolkata, Pune University, University of Hydrabad, Delhi University, AMU, The Maharaj Sayaji Rao University, JNU Delhi.
you can attain positions as Developers, Design Engineers, Data Base Administrator, Network Administrator, Data Analyst in IT industry and facilitate their placement in government, semi-government and leading companies like Cognizant, Accenture, HCL, Wipro Technologies, TCS, LG Soft, Tech Mahindra and Infosys. You can start your career in Teaching.

Hello,
No problem,
There are some of the colleges that gives admissions into BCA course also to students with commerce stream.You should find the list of such colleges and apply for them on their respective websites.Some colleges will take their own entrance exam while some colleges like BIT will give admission to candidates on the basis of class 12th percentage.
Good luck.