I have done MSc electronics, for which GATE exams can apply physics or electronics and communication or anything else
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Even though you have completed MSc in electronics, you have the option to switch branches if you clear gate and get a college. For example a student who studied mechanical engineering at xyz college can apply for Computer science branch at iit, nit, iiit and other top tier colleges through his gate score. To get admitted in top branches you need to have a high score in gate examination.
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Know your Chances for M.Tech Admission in Engineering Colleges based on GATE Score & Marks, Caste group, GATE Paper & Qualifying Degree.