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Electronics and communication engineering, or electronic engineering, is an engineering discipline where non-linear and active electrical components such as electron tubes and semiconductor devices especially transistors, diodes, and integrated circuits, which are utilized to design electric circuits, important devices, and systems typically also including passive electrical components and based on printed circuit boards.
This is a broad engineering field that covers analog electronics, digital electronics- both of them dealing with transmission of the signal, consumer electronics, and embedded systems and power electronics. Electronics engineering deals with implementation of applications, principles, and algorithms developed within many related fields, for example, solid-state physics, radio engineering, telecommunications, control systems, signal processing, systems engineering, computer engineering, instrumentation engineering, electric power control, robotics, and many others.
This area involves the transmission of information across channels such as a coax cable, optical fiber or free space. You can work on designing equipment such as routers, switches, multiplexers and electronic switching systems, copper telephone facilities and fiber optics. It develops everyday devices such as transistors, integrated circuits, and printed circuit boards (PCBs) which can be used in computers, MP3 players, cell phones, television to name a few. The discipline deals with electronic devices and software interfaces. The applications are far reaching, right from the indoors of the house to industries. The tasks of the Electronics and Communication engineers are to direct, control and test produce process a well as to ensure safety, installation, and functioning of the various mechanisms.
All the best.

Hello,
Yes, you can prepare for both exams, but you have to work hard for it. You can prepare for M.Sc after competing your CGL exam.
I would like to suggest you that SSC CGL exam is really close, so first you should focus on that. Try to solve previous year question papers and mock test papers of SSC CGL. You can learn short tricks to solve questions easily. You don't have much time to prepare. So, leave the topics which you have not started.
If you want to score high in English section then you can check the below mentioned link:
https://youtu.be/-4nac7a5BWE
You can check the below mentioned link for SSC CGL preparation:
http://eduinfo.kinja.com/ssc-cgl-2016-tier-1-tier-2-preparation-1783646128
I hope it helps.