hi,

see generally the eligibility criteria for bachelor in computer application course is candidates must have completed 10+2 course from a recognized education board. however in most of the tier 1 colleges eligibility criteria is candidates must have studied mathematics as a subject in 12th course.

also for master of computer application admission criteria, candidates who have completed graduation course in any discipline , as well as have studied mathematics as a subject in 12th course are eligible to apply. some of the best institute to pursue mca course is nits, jawharlal nehru university, birla institute of technology, delhi university, etc.

so you must take mathematics as a subject in 12th course, along with english and any other optional subjects. now in arts stream generally mathematics is not included, but if you choose para science stream you may study mathematics.