Mechanics

Dear Rajas,
If you are looking for post study job option, then Australia would be a better option as work permit option in UK is very tough now. IELTS is required for international students. You can check the university websites for admission requirements.

Canada currently is very welcoming in terms of job and education both whereas New Zealand boasts of some of the world known MNCs based there but getting a job might not be easy. Apart from the job market, you need to see the financials as well. Degree from both the countries is recognised all over the world. In terms of ranking, Canada has almost 300 universities preferred over New Zealand.

Yes, this is a good choice. NTTF is a good college and in future there is a good chance to get opportunity in your field.

Below mentioned are best institute to prepare for IAS exam:
1. Institute of Engineering Studies (IES - Bangalore).
2. GATE Indian Institute of Tutorials.
3. Elite IIT.
4. Himalai IAS Coaching.

It is an average university with decent placements, for details check link below :
https://www.shiksha.com/university/sathyabama-institute-of-science-and-technology-chennai-23588/reviews

As per better education in mechanical engineering, Germany is the best, but as per PR, Canada is the best place for everyone.

The most distinguishable difference is the probabilistic nature of quantum physics. In classical physics, all the parameters like position, momentum, time, etc are known exactly and absolutely. There is no uncertainty. But when it comes to quantum physics, we don't say "the particle is in this position". We say "the probability of finding the particle in this position is so and so". This way of looking at phenomena is inevitable in this realm and it can be used to explain a lot of things which couldn't be satisfactorily explained by classical physics.

Although, you should go according to your area of interest but if you are asking for the job prospect then CS has an upper hand as compared to mechanical and electrical. You can easily earn 30$ per hour after your degree completion.