GMAT

NMIMS accepts only NMAT score. The cutoff for the same varies from year to year. IT generally hovers around 208 marks with sectional cutoffs as well.
The specializations offered are Finance, Marketing, Operations, HR, IT.

Talking about MAT and CAT
MAT and CAT are entrance examinations for admission in management school. There are several institutes which accept both.
CAT is difficult as compared to MAT. MAT is the easier version.
Course wise there is no difference in the syllabus of two, only the level of questions are different. Questions in CAT are much difficult from those of MAT. CAT is conducted once every year and MAT is conducted four times in a year
Know more on :
https://edudrona.com/questions/question/what-is-the-difference-between-mat-and-cat

Hi, these cut offs along with the sectional cut offs mentioned on our website(www.spjimr.org) are mandatory for admission into the course.

GMAT is must to get a good college, score above 550 makes your way easy. As per my concern you should go for Canada because of affordable fee. Otherwise US is best because there are number of best colleges.
Good luck

Mostly all colleges in USA requires GMAT, TOEFL/IELTS and minimum work experience of 2-3 years.
In Australia, you just need to get 6.5 overall
Band score and work experience too to get admission.
Best of luck for your future

Sainath, GMAT score and XAT scores are not to be used together. Only one of these is to be evaluated - Your GMAT score of 700 will provide you with better opportunity than XAT score of 80 percentile. You will be eligible with your GMAT score.

by practice more and more mock test papers of last 12 years.

GMAT and IELTS are the bases for the admission. In case you try some low ranked university only then GMAT becomes optional. IELTS will still stay. For many programs universities accept gre also. You can try gre in case GMAT seems difficult

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