M.Tech Computer Science and Engineering

Go for MANIT CSE or B.Tech CSE programme instead of any dual degree at other institutions.

It doesn't matter on the course. It matters on your ability, how talented you are, your communication skills, your technical skills.
Both are good.
From my suggestion, go for B.Tech+M.Tech.

https://cbsenet.nic.in/CMS/Public/View.aspx?page=80
Yes, but be sure that your percentage is at least of 55% in your Master's degree. Please check on above link you will get the details. It is official site also.

GATE qualified candidates can follow the following procedure to apply in IPU for M.Tech CSE:-
1.Apply by filling the application form first. The last date of filling the application form is May 1, 2018.
2. After having filled the application form, a merit list based on different scores will be issued by IPU. Keep yourself updated about the merit list by visiting http://www.ipu.ac.in/
3. Based on your gate score you will be called for counseling most probably in June/July.
Hope this helped :)

If we talk in terms of placements and companies, then best specializations will be:
1. VLSI and Microelectronics -: Most of the industrial jobs and research sectors of electronics recruit from this branch.
2. Communication -: For telecom sector.
3. Signal Processing -: If you like mathematics, then this branch would be ideal for you. You can also opt for M.Tech in CSE, the choice is yours. Regards.

Hi,
You can apply for the Master's programs. The admission forms are available, as the last date to apply for JMI is 14th March. Best of luck.