GRE

GRE test is required for admission to most graduate schools and a growing number of business schools. It is mainly for admission in Masters.
It has 3 mains sections :
1. Analytical Writing Measure - Analyze an Issue, Analyze an Argument( 30 Minutes each)
2. Quantitative (x2) - Multiple-Choice: Select One, Multiple-Choice: Select One or More,Numeric Entry,Quantitative Comparison (35 Minutes per section (70 mins total) )
3. Verbal (x2)Text Completion- Sentence Equivalence, Reading Comprehension(30 Minutes per section (60 mins total) )
Total Exam Time - 3 hrs, 10 minutes
The verbal section of the GRE is focused more on vocabulary.

You don't need to join any coaching institute for GRE. Just get some good books, work hard on your english. Increase you vocabulary, spend some time on practising maths. After GRE, appear for TOEFL.Refer to the following website:
edulix.com. It is called Bible of GRE.
All the best

mostly gre helps in getting a good scholarship but with good academics also there are certain scholarships which u can get in India check the dead site for more information.
hope this helps

Hi
There are no cutoffs first of all in Canada or any country abroad except India. MBA mostly requires GMAT score and you can check further details here.
http://www.oxfordseminars.ca/GMAT/gmat_profiles.php

Not necessary but having a GRE score will help. There is no minimum percentage, students accepted are academically strong and have percentiles as high as 90%. So if you have more than 75% you may have a chance.

Hi
All information you required is listed out here for USA. Other countries like canada do have rolling admissions so the best is to shortlist universities and then apply.
http://www.studymsinus.com/list-universities-offering-ms-misismismitm-us/

Yes, and besides you also need to learn German language.

Both are totally different streams and both have different scopes, comparison therefore is not possible. Just choose the one that you are really passionate about. Don't listen to people around you and get confused, otherwise you will go haywire. Just think, realize follow your dreams.

Any one from each.
Regards

Hello, well it depends where you want to study. Not all universities require GMAT or GRE. As an international student however you must take TOEFL or IELTS.
Regards