Mechanical Engineering

Hello Shweta,
As It seems that you have 3 years' diploma. After this, you pursue a Bachelor course anywhere in abroad. There are chances that few universities will give you a direct entry into 2nd year of the under-graduate course.
Most of the countries are proving 3-4 years of course in Bachelor level.
For more, you can consult MS. Chetna S on https://shiksha.com or on www.bassekraah.com

As per your graduation score, you have to appear for GRE. GRE is not mandatory for Canadian universities, but it is a profile booster.

After Mechanical Engineering there are lots of options available for jobs. You can get a job in automobile or construction industry. You can get into the maintenance department of any company. You can join consumer's goods industry. Also, various other industries and companies have mechanical engineers in production or maintenance division like consumer goods industry. FMCG recruits mechanical engineers for production department. Automobile spare parts industry may take you. There are lots of opportunities in government and private sectors.

Yes, it is a better option and according to my opinion, it is better than the best if you are interested in it.

Some colleges may allow this after the completion of the first year provided you have got good a score in the first year. For complete details, you must contact your college authorities.

Yes, you can do that, but you need to score good marks. The transfer process completely depends on student's merit.
All the best.

Getting admission in TU9s is tough because of your UG score. You can apply for some applied Science universities as they are equally good. Your GRE and TOEFL scores are excellent, but you should also try for some TU9s too. Universities like TU-DORTMUND, TU-BERLIN or TU-HAMBURG may select you.

Yes, you can. You just need dedication and passion for CA.