M.Tech

First shortlist the universities offering the course. Then see the exam requirements - if they require GRE for MTech or not. Apart from GRE, you will be required to appear for either IELTS or TOEFL.
Here are the documents required for admission -
Attested copies of mark sheets of Standard X, XII, and the Bachelors degree (if applicable)
At least, two academic reference letters from professors who have taught you most recently
If you have work experience then two letters of recommendation from the employer/manager who knows you well and can comment on your professional abilities
Statement of Purpose (SOP)
Resume
Photocopied score reports of GRE / IELTS / TOEFL
Portfolio (in case of Students applying for art and design courses & architecture programs)
Others (certificates / achievements at the state and national level and extracurricular activities)
Proof of funds
Medical Tests
In case, you are looking to pursue diploma course, here is a link to help you https://studyabroad.shiksha.com/documents-required-for-diploma-courses-in-canada-articlepage-601