GRE

IIT's require GATE score for M.Tech in India, GRE is applicable to foreign countries. Your GRE score is good and have a good work experience, better choose for MS in a road that will help you to grow very soon. All the best.

Yes, you can easily get great universities in Canada, like University of Toronto, McGill University, University of Calgary, University of Ottawa and many more with IELTS requirement of 7 or less (6.5 in each section) and 6.5 (6 in each section). Good luck and apply soon since deadlines have started to close.

Below are the Universities that can be considered. University of Illinois, Chicago
UNC Charlotte
UC Riverside
University of IOWA
Clemson University.

Hi Nashik, you can take these tests while studying also or even after B.Tech. You must make sure to take the tests before the admission process, so that you can apply on time by the deadlines.

You may if you also have satisfying grades and if you meet other requirements as set by them. Depends on how selective they are while evaluating your profile, depends on profiles of other applicants, you just have your give your best shot.

Hi, GRE scores are valid for five years while IELTS scores are valid for two years. Once expired and you still have to apply to universities you must take the tests again.

Hi,
You can start preparing from anytime you want, there is no hard and fast rule here, you can prepare slowly and steadily. Scores are valid for five years. 310 and above is the recommended score.

According to me both are great. You can take educational coaching both online and offline. Online mode will help you in writing and comprehension sections. While offline mode will help you in understanding the course material.