BCA

In my opinion, it is BCA.
Well, if you are looking for a career like a Software Engineer, Developer, etc. then go for BCA. But if you are looking a career in academic research, teacher or professor then go for B.Sc. In simple terms, Corporate Job- BCA and
Research Job- B.Sc.

Canada requires 10+2+4 then PG Diploma or Masters. As BCA is a three-year programme, you cannot do PG Diploma. You can do one-year graduate diploma and then do Masters.

Yes, you can if you have passed class 12th in science.

What do you want to ask?

No, it is not necessary to take computer as a subject for BCA as you will learn from basic itself from the very first year, but it is necessary to have some basic knowledge about what you are going to opt for.

Yes, but mathematics comes in 2nd sem in BCA.

Yes, you can do BCA. Still, you may face mathematics and physics in 2nd semester. So, you should ready to face this.

In MGU, the entrance for BCA and other UK courses happen in mother of June- July.
Regards.

No matter, you can do BCA. Physics and mathematics can come in your 2nd semester. Fundamental computer and digital electronics comes in your 1st semester. In your 3rd and 4th semester, you can learns object oriented programming language.

M.Sc with computer Science or IT is better than MCA. MCA is a 3 year programme where as M.Sc. Computer Science is a 2 year programme. MCA covers the software and its application related field. M.Sc. Computer Science covers the both hardware and software field. A person with strong background in computational and scientific field is only able to opt for this course. Those who have pursued a graduation in computer Science or computer technology alone can opt for M.Sc. Computer Science, while MCA can be done by any Science graduate.