Dual

If you are getting good NIT then you should go for that. Dual degree is also good option but doing B.Tech from NIT is far better than that.

Admissions are based on merit out of the applications received and shortlisted. At present Integrated M.Sc computer science course is not offered.

B.Tech there is Jee mains entrance exam for master degree there is no such requirement.
You can take admission in VIT Vellore on Merit Basis.
Best Of Luck,

Alliance Bangalore. You will get variety of options to choose from.

Integrated programme are only for Software Engineering course and the application is common as for other B.Tech courses. You will have to qualify the exam and then select.

https://www.google.com/amp/s/www.shiksha.com/animation/2d-3d-animation/course/amp/integrated-b-sc-m-sc-in-multimedia-st-xavier-s-college-park-street-Kolkata-281121
Hope this will help you.

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I'll refer you to join B.Tech CSE rather than integrated 5 year course because if you change your mind in 4th year of your graduation seeing that time scenario then it will be better for you to join MBA or by qualifying GATE you can join any of the PSU because joining integrated course is only beneficial if you have clear goal to join in research or be a professor in any college.