B.Tech Mechanics

Four year undergraduate Engineering BSc Engg awarded by German Universities is equivalent to BTech/ BE in India and acceptable across the globe. By the way, few years back in India also BSc Engg was the engineering degree awarded by few of Indian universities.

I depends on which NITS you are referring! cuz some of them are good than thapar so u should choose wisely just check below link
http://m.timesofindia.com/tech/slideshow/technologycolleges/10-Tech-colleges-that-got-best-placements-in-10/itslideshowviewall/7029610.cms

1.4 lac year +hostel

Hi
You can go for GMAT and TOEFL and try to score good in it. Any internships done during b.tech also matters. Write your SOP and Start shortlisting universities in Canada, Australia as they consider without work experience too.
Hope it helps.

Hi
The general requisites for b.tech are atleast 80% but you may try some universities which accept pathways program where you spend a year to fulfill the pre requisites.
https://googleweblight.com/?lite_url=https://studyabroad.shiksha.com/studying-in-germany-all-you-need-to-know-articlepage-184&ei=rQO5lRB0&lc=en-IN&s=1&m=713&host=www.google.co.in&ts=1460689639&sig=APY536yzngkTK29vlregeuk-FJtJxZSKJQ

iit bits vit srm etc.

Hi
For masters or Phd, it mainly depends on what is your research area and how good is your overall profile in terms of projects taken, activities participated etc. You have to write to the faculty about seeking admission so here is the link.
http://www.engineering.ualberta.ca/GraduateStudents/GraduateAdmissions.aspx
Incase you need further guidance, feel free to post here.