Canada

There are a range of courses that you can consider. Select the one that aligns with your goals the best.

You can consider following options:
MBA.Computer Science & IT.Business & Finance.Core Engineering & Engineering Management.Physical & Earth Sciences and Renewable Energy.Agricultural Science & Forestry.Biosciences, Medicine & Healthcare.Media & Journalism.

It completely depends on your profile including projects, internships and Research along with Grades in Colleges but just don't forget Letter of References matters a Lot.

IELTS or TOEFL either works. GRE will depend on the university under consideration.

Yes you can. Provided you qualify all eligibility criteria.

Yes, you can. However, it is preferable that you work for a couple of years understand your interest areas and then take a call on further education.

Hello,
Your intentions are indeed great. But, unfortunately what you seek is not feasible. However, you can seek admission in first year in Canadian universities. For this I would like to advise you to approach a local agency dealing with sending students to Canada for graduation. Best wishes to you.