BCA

It differ from university to university.
Some university also take admission of commerce students, but if you don't have Maths background in class 12th, it might be little difficult, but if you can catch up that, I think a commerce student can also apply for BCA course.

Check out the list of top BCA colleges in India and filter out the government ones:
https://www.shiksha.com/it-software/ranking/top-bca-colleges-in-india/96-2-0-0-0.

BCA (Bachelor of Computer Applications) is a 3-year graduate degree course that deals in basics of computer applications. The course eligibility is 10+2 from a recognized board with minimum aggregate marks with English as per the institute's requirement.
Hence, you are eligible for BCA course.

Yes, you can definitely join CDAC after BCA.
Follow the links below for details:
https://www.cdac.in/index.aspx?id=edu_acts_CertificateCoursesList
https://www.cdac.in/index.aspx?id=DAC&courseid=0.

Mentioned below are some of the top BCA colleges in Ahmedabad:
GLS Institute of Computer Application, Ahmedabad
Xavier's Institute Of Computer Application, Ahmedabad
HL Institute of Computer Applications, Ahmedabad.

Hi,
It is not a feasible option, you don't have enough percentile, firstly and secondly you do not have work experience, which is required for MBA in Canada or anywhere abroad. You can complete a PG Diploma in India with good grades and then look for ventures abroad.

Hi,
You can opt for a course through correspondence, as you cannot resume your studies through regular mode.

Dear Adithyash, Greeting from AIMS Institutes. If you have completed diploma in karnataka technical board you will be eligible to apply for BCA program. For any query, you can mail us on admission@theaims.ac.in
With best wishes, AIMS INSTITUTES, Bangalore.