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If the admission eligibility states maths as a requirement then, you will not get admission into that programme.

Yes, if you had done class 12th, then you are eligible for this course. Best of luck.

BCA is a course with same syllabus as that of IPU or any other university, nobody can judge how good a faculty can be, because in colleges everything depends upon students only. Moreover, you will have to pursue a master degree after BCA. So, it really doesn't matter that how good is amity or any other college.

Since you haven't got a job in 3 years, I would suggest you change fields and opt for something that interests you and complements your skillset.

Hi,
It is not the matter that you are from which background. It matters that how much you are interested to do.
There is no technical issue, you can do easily.
Good luck.

For any engineering college admissions you need a JEE Mains score or specific state level exam's score. 12th percentages doesn't matter much now a days.

Yes, it is possible, you can take NOC from your college and take admission in 2nd year.

NIOS marksheet and passing certificate is required.

You can join, but it is good for nothing.

Most of the colleges in Gujarat accepts CMAT for MCA admission. There are few more colleges, but you would have to check individually.