B.Tech

For admission in Polytechnic course after 12th (Science) you need to crack an entrance examination called Diploma entrance test, otherwise can join any private institution that perform their own Diploma qualification test. After joining there is a branch selection in which you have to a specific branch like mechanical. Following are some top colleges where you can apply:
All India Shri Shivaji Memorial Society Polytechnic
Anjuman Polytechnic
Bhandara Polytechnic
Acharya Shriman Arayan Tantra Sansthan
Amrutvahini Polytechnic
Guru Nanak Dev Polytechnic
Meera Bai Polytechnic
Tool Room & Training Centre
Arya Bhatt Polytechnic
Gobind Ballabh Pant
Kasturba Polytechnic for Women
Aryabhatt Polytechnic.

Let me be honest, I am a student from CSE department. Actually CSE is considered to be a subject which provides you assured placement and that too with very higher package than any other branch. Basically, it guarantees you a peaceful and prosperous life ahead; at least in terms of money. And who does not want to secure his/her future? So the main reason is pretty clear!
However some top students do take CSE as they have a lot of interest in it. Some top students also take physics, engineering physics and other branches too because they are interested in those topics. Also, the best coders on Codechef maximum time is from CSE departments. Lastly, ill conclude this stream has more opportunities and exposure (that's the reason for me)
I'll guess it will help you.
Best of luck
Thank you.

Hi,
This course has good scope because we are going in to more technology. But it is very important that you do this course from a good university. When it comes to good university it includes good faculty, infrastructure, extra curriculum activities, placement etc. You need to do selection carefully. I am enlisting some top universities:
HBTI Kanpur
Lovely Professional University, Jalandhar
Thapar University, Patiala
MIT Pune
These universities provides extensive learning programs and exposure to the students. They also provide worthy scholarships to its students depending upon the entrance test taken of the university or board result. I hope it helps.