Canada

Dentistry in Canada is a second degree which means that you can't study of after doing your 12th here. You have to do your Bachelors in Canada (preferably in biological or medical stream), then clear the competitive exam, interview, etc.

You can give any one. Both are accepted. But if you are applying to an SPP college then IELTS is preferred.

Everything is possible but that does not necessarily mean that it is probable. That's the short answer. Long answer, yes, it is possible as long as you meet the required criteria for PR. However, chances are that you will not meet their criteria and so it may not be possible for you. For the criteria details log into IRCC/ CIC website:
http://www.cic.gc.ca/english/immigrate/INDEX.PHP

Hi Harsh, every college and program have different requirements. It is difficult to say which course you can pursue or which university you will be admitted. 12 is a big number, apart from this you must check your academic grade requirement and also IELTS/TOEFL score requirement. Also which course you want to study is your choice and decision. Whatever you study must be relevant to your education background.

Hi Robin,
Some of the best are Western University, University of British Columbia, University of Toronto, Queen's University, University of Manitoba and University of Guelph to name a few.

Hi Jaspreet,
Concordia University and McGill University, two of the best universities in Canada are located in Montreal and offers Aerospace engineering too. Check university website for details.

Hi Pruthvi,
To get a visa you must apply to a college first and receive the admission offer. Admission requirements of colleges in Canada are very competitive, you must have good grades and must also take the IELTS or TOEFL. Accounts, Finance, Hospitality, Business, Economics etc are some options relevant to your background. Best differs from person to person. I am not aware of your skills and talents so can't tell you what is best for you. However you will know it, weigh your strengths, likes and dislikes and choose a field you will enjoy studying.

You should check the website of the selected website.

Yes, you can apply through university's website.