Mechanical Engineering

You are advised to do M.Tech in aeronautical engineering to have a career in aviation industry in engineering roles. With M.Tech in AE you can get entry in airlines, aircraft manufacturing companies & its ancillaries, DRDO, ISRO etc. With mechanical engineering you can join Indian Air Force in aeronautical engineering, mechanical branch and IAF will train you in field of aeronautics.

If your B.Tech degree is from a UGC recognized university or AICTE recognized institute then you are eligible for all government jobs where eligibility criteria is a graduation degree.

Yes, your IELTS score is good. You can get the student visa of Canada.
All the best

For that you would have to take admission in PGDM core and then in 2nd year take HR as your specialisation. Exact fee structure is given on the website. Last year it was around 12 lakhs (2 years).

There is nothing called MBA in engineering. MBA is done after any UG programs like:
1. Engineering.
2. BA.
3. B.Com.
4. BBA, etc.

There are a lot of colleges in Pune for the same.
You can find about the best colleges on https://shiksha.com.

For changing your college, you have to clear all the exams of first year. Then you can apply to any college for migration but the college must be from the same university.

Yes, you can apply for B.Sc. But remember that both are different fields and you have to start from the beginning for this.

Hello,
After completing your engineering, you can go for higher studies like - M.Tech, M.Sc or MBA etc.
But if you want to get a job, then you have many options available like -
There are many jobs available for engineers in Indian Government.
You can apply for Railway RRB JE or SSE Exams or SSC junior Engineer Exams etc.
Click here to know more about Railway Exams - http://entranceexaminformation.blogspot.com/2016/06/railway-rrb-exams-are-you-prepared-for.html
I hope it will help you.
Best of luck.