CBSE 10th

Yes, some private institutes allow you to do it.

Take that course in which you love to work and you have very much interest in it along with curiosity.

NSB accepts all test scores. The basic qualification required is graduation in any discipline. In order to know about the CAT percentile and other test percentiles, you will have to talk to our admission officer.

I will personally recommend you that go after completing 12th. It will very easy for you after it.
And if you go after 10th, then you might have to repeat 10th.

It's better to go to Canada after your 12th. Visit:
www.schoolsincanada.com

Your profile looks pretty decent. As it is a profile based selection, there is proportionate weightage given to all factors. So hope for the best. You have a good chance.

It is possible. Just apply for some college aboard online. But it is good to study in our own country till 12th standard. But after complete class 10th, you don't have that much of maturity to decide about your future or career and studies in a foreign country is very difficult. There is a tremendous scope after class 12th for your Bachelor's and Master's degree aboard.