Canada

40 percent is quite a low score to be honest. Foreign universities make sure they give admission to those students who are having at least 60 percent marks.

No one course is 'best' for everyone as the best course for you has to be defined on the basis of your academic profile. You haven't mentioned your educational background or what are your interests. So it is really hard to answer this question.

No one course is 'best' for everyone as the best course for you has to be defined on the basis of your academic profile. You haven't mentioned your educational background or what are your interests. So it is really hard to answer this question.

Hi, you can use a number of salary tools available online. One such is http://www.payscale.com/research/US/Job=Mechanical_Engineer/Salary
For the second part, please refer to the query I have already answered. Hope this helped.

Hi, you must have the skills, expertise, excellent academic records , communication skills, leaderships skills and significant work experience too. Learning foreign language will also help.

Hi
Which diploma have you done? You need to be 18 years to study in Canada. If you have scored 70-80% in your diploma, you may write to the colleges in canada to check if eligibility is fulfilled or not.

Hello, a tricky question to answer as jobs depends on an individual's own competency regardless of the country. While US and Canada are developed nations with plenty of opportunities no one can guarantee you a job. However since you are interested to know Germany is a hub of this area.
Regards