For admission in Bachelor of Computer Application (BCA), a student must complete X+II with Mathematics. So, if you want to take admission in BCA, you have to study X+II with Mathematics. Students of any stream (Science, Commerce or Humanities) with Mathematics at X+II level can take admission in BCA. However, some Universities/Institutes have kept minimum eligibility of marks (60% in aggregate for General category students) for admission in BCA.
Generally scope of good job in IT sector after doing BCA is limited, as many students holding MCA degree are easily available in India.
Joining business depends on various factors like family background, availability of resources, etc. So, no specific comments should be made in this regard.
Non-violence is the greatest Dharma; So too is all righteous violence.