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It is a good course for the filed in which you are in Sony. So I suggest that you go for this course at the first opportuity.A number of universities offer a 3 year B.Sc., / BA in Nutrition / Dietetics. These subjects are also offered as a Post-Graduate specialisation both at the degree(Masters in Home Science / Applied Nutrition) as well as post-graduate diploma level.
Some of the institutes are;
1. All India Institute of Hygeine & Public Health, 110 Chittaranjan Avenue, Kolkata - 700 073, West Bengal URL : www.wbhuhs.org
2. University Of Mumbai, MG Road, Fort, Mumbai - 400 032, Maharashtra URL : www.mu.ac.in
3. Avinashilingam Institute for Home Science & Higher Education For Women, Coimbatore - 641 043 , Tamil Nadu
4. Guru Nanak Dev University, Amristar - 143 005, Punjab URL : www.gnduonline.org
5. National Institute Of Nutrition, jamia Osmania, Hyderabad - 500 007 , Andra Pradesh URL : www.ninindia.org
6. Osmania University, Hyderabad ( University College For Women, Koti) URL : www.osmania.ac.in

Because of the word limit, I am giving you the links only. Just go through these.
about the test http://www.ets.org/gre/revised_general/about
content of test http://www.ets.org/gre/revised_general/about/content/
Computer-based GRE revised General Test Content and Structure http://www.ets.org/gre/revised_general/about/content/cbt/
Paper-based GRE revised General Test Content and Structure http://www.ets.org/gre/revised_general/about/content/pbt/
Fees http://www.ets.org/gre/revised_general/about/fees/
registration http://www.ets.org/gre/revised_general/register/
for CBT http://www.ets.org/gre/revised_general/register/cbt/
for paper based http://www.ets.org/gre/revised_general/register/pbt/
coming onto coaching for GRE, the best ones are Jamboree, TIME, IMS etc.
Do let me know the place where you want to take the coaching and i will let you know the coachings available there.

Mechatronics is the combination of Mechanical engineering, Electronic engineering, Computer engineering, Software engineering, Control engineering, and Systems Design engineering in order to design, and manufacture useful products. Mechatronics is a multidisciplinary field of engineering, that is to say it rejects splitting engineering into separate disciplines. Robotics is the branch of technology that deals with the design, construction, operation, structural disposition, manufacture and application of robots. Robotics is related to the sciences of electronics, engineering, mechanics, and software and has more modern technology. Evaluate yourself as to which one would come easirier for you when inherently. Mechatronics is not much away form usual where-as Robotics will have many new things as of now. It is a matter of personal interest. Career-wise Robotics still does not have that much scope as of now (at least in India) comapred to mechatronics.

Simultaneously with ur MCA get hands on with C on Linux, C++ on Linux, JAVA on Linux, PHP on Linux MySQL Database, Oracle Database as well. Cos Most of the Solutions now a days r Network Solutions and Linux is most popular in Network solutions. If u get certified with RHCE which will give u Linux Administration knowledge+hands on practical experience & PHP & MySQL combination for Web Development will be ultimate. If u r not looking for getting degree only then u can directly go for Certifications only and get much early JOB. First u decide in which line u wanted to work in IT line. U must have to get certified according with latest industry trends.cos Degree will provide theoretical based knowledge according to their syllabus only. But Industry runs on the latest practical trends only. There are lots of Job opportunities in System Administration, Network Administration, Web Development, Security Administration, Database Administration, Virtualization Administration, Data-center Administration, JBOSS Administration, JAVA Professionals, Kernel Internals, SAP-ABAP, SAP BASIS, ANDROID - mobile application Development and many more. These specializations can be done through International Certifications only not by getting degree.

yes you can
FOR M.Tech.
Eligibility for admission to M.Tech. is a pass in qualifying examinations (specified below) With not less than 50 % marks in aggregate of all the semester / years of degree examinations. In the case of candidates belonging to SC/ST and cat. I, marks shall not be less than 45 %.
Power Electronics
Bachelor degree in Electronics and communication / Instrumentation Technology / Telecommunication / Electrical and Electronics / Bio medical Engineering / Medical Electronics / or equivalent degree; AMIE in appropriate branch. GATE ; EN,IN,EE.
Thermal Power Engineering
Bachelors degree in Mechanical Engineering / Industrial Production Engineering / Automobile Engineering / Manufacturing Engineering / Industrial & Manufacturing Engineering / or equivalent degree ; AMIE in appropriate branch. GATE ; ME, PI