CBSE 10th

If we talk about easiness, I'll suggest Commerce.

Refer to the link below:
http://kvpy.iisc.ernet.in/main/eligibility.htm

Yes, you can. But you need to score good percentile in the entrance tests.

possible, u have to pass a simple entrance exam to study BA/B.Com through open university system.,
see times of India regularly.
search OUS-degrees on net

no problem, do degree with higher percentage

With your scores, it will be extremely difficult to get a call from XLRI. You will atleast need a 70,70,70 to become eligible for an interview call. Your scores are even below a 60,60,60 which puts at a huge disadvantage.
You should target other less competitive Management Colleges. Work on building a good profile and aquire good work experience. Also, you need to score among top rankers in the XAT exam for this.

Hi,Your query seems to be incomplete. Kindly ask specific questions about admission so that our experts can guide you accordingly.
All the best.

If you manage to get admission at a Canadian university, then you can get the visa. As long as you have goof IELTS scores, are admitted to a good course at a reputed Canadian university and show genuine proof of funds, student visa shouldn't be a problem.

You need to study further Harshvardhan for XI th and XIIth. Ypu need to choose a stream of subjects for it based on your interest and for the kind of career you want for yourself.