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If u really want to do b.tech then why you are doing it from the normal colleges fall under wbjee, which don't have a lot of reputation and so the high level placement and hence the term is all over to the agenda of the high package salary and reputation also.here is a list of given colleges and their names and in those university/colleges are really gud and you can take admission in any of these colleges and can get high level placement and so gud education for engineering department also.the names with their websites are-
1. Indian Institute of Technology(IIT) Delhi http://iitd.ac.in
2 Indian Institute of Technology(IIT) Nankari, Kanpur http://iitk.ac.in
3 Lovely Professional University(LPU) Jalandhar, Punjab http://www.lpu.in
4 Birla Institute of Technology and Sciences(BITS, Pilani) http://bits-pilani.ac.in
5 Institute of Technology, Banaras Hindu University (IT, BHU) http://itbhu.ac.in

In engineering there are many branches & electronics & communication one of them.
Electronics - Electronics deals with electrical circuits that involve active electrical components such as vacuum tubes, transistors, diodes and integrated circuits, and associated passive interconnection technologies.
Communication - Sending & receiving message is called communication by any means is called communication.
Combination of both is known as electronics & communication.
In this discipline we study about non-linear and active electrical components such as electron tubes, and semiconductor devices, especially transistors, diodes and integrated circuits, are utilized to design electronic circuits, devices and systems, typically also including passive electrical components and based on printed circuit boards, basically component of low voltage.
It is also related to electrical.
Sub-fields are: Signal processing, Telecommunications engineering, Control engineering , Instrumentation engineering, Computer engineering, VLSI Design Engineering.