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Hello Senthil Arumugam,
It is nice to see your enthusiasm to study Bachelor of Engineering, in spite of completing your Diploma in 2014. I am attaching a link that will give you all the required information about an entrance exam that you need to appear for and pass for admission in lateral mode for an engineering college under Punjab University at Chandigarh. There are certain eligibility criteria which are available on this link and I will advise you to go through them to see that you are eligible from different perspectives before you appear for this examination. https://www.shiksha.com/university/panjab-university/amp/puleet-exam#referrer=https://www.google.com&_tf=From %1$s
Best wishes to you.

Top colleges offering M.Tech in sound engineering are:
1) IIT Kharagpur
Course:- M.Tech in Media and Sound Engineering
2) ZEE Institute Of Media Arts (ZIMA) Mumbai
Course:- Sound Engineering - 9 months
3) National Institute of Film and Fine Arts NIFFA, Kolkata
Course:- Certificate in Sound Recording and Editing
4) Government Film & Television Institute in Bangalore
Course:- 3 year Diploma in Sound Recording & engineering.
5) Film and Television Institute of India, Pune
Course:- Post Graduate Diploma in Sound Recording & Sound Design
6) Digital Academy The Film School Mumbai
Course:- Sound Recording & Engineering Course
7) Department of Music, University of Mumbai
Course:- Six Months certificate course in - Sound Recording and Reproduction Course (SRR)
8) College of Applied Science, Vadakkencherry
Course:- Post Graduate Diploma in Audio Engineering
9) Biju Patnaik Film and Television Institute Cuttack
Course:- Diploma in Sound & TV. Engineering
10) Sri Aurobindo Centre for Arts and Communication, School of Arts New Delhi
Course:- Sound Recording & Design
11) Department of Film & TV Studies, Bharatiya Vidya Bhavan New Delhi
Diploma in Video Editing and Sound Recording (EDT)
12) CRAFT Film School
Course:- Post Graduate Diploma in Sound Recording & Audio Engineering
13) ARM Academy of Radio Management
Course:- Certificate in Sound Recording & Radio Production
14) Asian Academy of Film & Television
Course:- Video Editing & Sound Recording - 3 months programme.

You should not have any confusion on your department. These days, lots of institutes are available to do the course. When you have a clear vision, so you can go directly into that particular department. Otherwise, they make you choose what they are offering. This will lead you to a big disappointment, when you notice you are not in a right track, which you are interested in. Nowadays, Animation and VFX are used everywhere right from the school educational videos to big feature film. There are lots of opportunities. So, do not worry about career. Just focus on what you do and become a professional in that. Animation and VFX are two different ways. In Animation, 3D and 2D are there. The new aspirants who is passionate about this topic should know exactly what it means. In which you are passionate about. In 3D field, there are departments. Modelling, Rigging, Sculptor, Animator, Efx, Match move. In VFX also, we have different departments from the first Rotoscope, paint, compositing. Some Special departments are there like motion graphics, matte Painting, Story Boarding. For more such information, visit at https://www.shiksha.com/animation/2d-3d-animation/articles/animation-an-exciting-career-option-blogId-8533.

Here, the difference is based on the curriculum.
Computer Science students study Algorithms and Data Structure, Architecture, Artificial Intelligence and Robotics, Database and Information Retrieval, Human-Computer Communication, Numerical and Symbolic Computation, Operating Systems, Programming Languages and Software Methodology and Engineering.
Information Technology deals with installation, development and implementation of computer systems and applications. Under this stream, students learn the following: Data Structures and Algorithms, Microprocessors and Interfacing, Computer Communication and Networking, Database Systems, Internet Technologies and Applications, Software Engineering, etc.
Hope this helps.