Australia

Sorry but your CGPA is too low, and you might face difficulties to get admission. Contact good consultancies which have proven success record and try for admission.

Since you do not have a very good academic background, so you might not get approval from the universities abroad. So, firstly give IELTS exam, then see which college accepts your IELTS score and if they can also accept your past academic scores then well and good or else go for low-grade colleges.

Yes, if you have a very good score, then they might give you a scholarship but not 100%.

No, they do not provide lateral entry. You have to start from first year itself to study there. Good luck.

To do Masters in Canada, IELTS is must but some colleges can accept TOEFL too. In Australia, IELTS is mostly accepted in colleges. So, I personally suggest you give IELTS exam. Also, GRE is not mandatory, but it will enhance your application and you might stand out from other students, so there's more chance to get the admission.

You have to have a percentage above 85 to get admission in postgraduate degree in Australia.

Yes, you can do MS after mechanical engineering. It is a good option. And, you can choose automotive industry you will get good opportunities there. Good luck.

Yes, you can get working visa for these countries. You can work in foreign don't worry. Good luck.