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You have to give BITSAT test for entrance into BITS.
There is a provision for board toppers for direct admission.
Check this link for eligibility:
http://www.bitsadmission.com/Eligibility_Criteria.aspx
http://www.bitsadmission.com/bitsat/BITSAT2018brochure.pdf?id=new
Direct Admission to Board Toppers:
In the past, admission process of the Institute always ensured guaranteed admission to all the students who obtained first ranks in their respective board examinations. This has given a very vital input of highly meritorious students from all over India. First rank students of all the central and state boards in India for the year 2018 will be given direct admission to the program of their choice, irrespective of their BITSAT-2018 score, as per the eligibility criteria mentioned above. Further details about this scheme will be available at BITS admission website by 1st of May 2018.

Electronics and Communication Engineering deals with the electronic devices and software applications. It is an interface of chip level hardware and information technology.
Course and Duration:
Electronics and communication engineering is an emerging field of engineering. In first half of the course, the students go through the basic engineering concept, physics, mathematics and chemistry. In the second half of the course, the students go through the core study of communication such as design, digital electronics, fundamental of Electronics engineering, signal & circuit, electronic circuits, VLSI, power electronics, computer architecture, and control systems. After completion of UG degree the students are designated as the Bachelor of Engineering or Bachelor of Technology, depending on the University. A Bachelor degree usually covers the mathematics, physics, and computer Science. You can choose the Electronics and Communication Engineering, after completed 12th examination with mathematics and Science. Electronics and Communication Engineering has expanded in various specializations as the following. Signal Processing.
Telecommunications Engineering
Control Engineering
Instrumentation Engineering
Computer Engineering
VLSI design Engineering
Jobs & Career
This field has an opportunity in two types of companies, Telecom Industries and Software Industries. An electronics and communication engineer can work in aviation and avionics, consumer electronics, electricity plant, manufacturing, transportation, communication & telecommunication, computer application, radio & television, diagnostic equipment manufacturing and offshore companies. There is an opportunity to get a central government job, state government job and in public & private sectors. What will be your Job Profile? Some job titles are listed here:
Electronics Engineer
Field Test Engineer
Network Planning Engineer
Electronics and Communications Consultant
Customer Support Engineer
Electronics Technician
Associate First line Technician
Research and Development Software Engineer
Service Engineer
Senior Sales Manager
Technical Director
Here are some reputed firms which require the electronics and communication engineers whenever:
BEL
DMRC
Siemens
Texas Instruments
Intel
nVIDIA
Philips Electronics
Motorola
Samsung
Conexant and Flextronics
DRDO
ISRO
Infosys
TCS
Wipro
Accenture
HCL Technologies
Tech Mahindra.