GRE

First decide which country. Consider the factors like duration of the course, cost tuion fees and living expenses , possibility of how much you can earn on part time jobs, employability, stay back options. Once you decide the country decide what you want to study, based on this select the University. you can apply directly in line or through authorised agents.

Hi Sachin
Please see https://www.shiksha.com/Shiksha-The-Learning-Centre-Ambawadi-Ahmedabad-institute-college-listingoverviewtab-36032

Hi Repudaman, please check the website for such information. Kindly do not post irrelevant queries which are easily available on an university's website. Here are important links if you haven't checked yet
https://www.concordia.ca/encs/mechanical-industrial/programs/graduate/mechanical-engineering-meng.html
https://www.concordia.ca/academics/graduate/calendar/current/encs/engineering-programs.html#encsmeng
Hope this helped.

Hi Rukmesh, which course are you planning to go for?

Dear Rohan, Germany is the ideal and number one for mechanical engineering. Your grades are slightly less competitive for Germany hence I would recommend you take the GRE. Additionally knowledge of German language will really help.
Regards

Good universities do require GRE/GMAT and TOEFL. You may see the prospects, fee, eligibility etc of an international degree by LSE here:
http://www.masterstudies.com/MSc-Human-Resources-and-Organisations/UK/LSE/

Hello Deepak,
There is no minimum criteria set by these universities. However if you check the websites and previous admission trends you will observe that GRE scores of 310 and above is considered to be good. Your score in any one of the three sections of the exam must be above the 50th percentile to be on the safer side. Hope this helped.

Hello Pawan,
All the tests you mentioned do not co-relate with each other so you must decide what you are looking for career wise and interest wise. GRE is mainly for MS programs abroad, IIT JAM is again the joint tests for technical courses in IIT and SSC is taken for various openings under the Ministries and Departments of the Government of India and in Subordinate Offices. You will be the best person to know what you should pursue. You may be required to take more than one tests and but decide what is best for you by identifying your career goals. Good Luck

Hi Kunal,
You must target a GRE of above 310. If your academics are not good you must work hard on your GRE. best of luck.

Hi
Though they hvnot mentioned any GRE requirement, I would suggest you to confirm by writing a mail to them.
Here are the details otherwise.
http://mech.mcmaster.ca/graduate_admissions.html#requirements