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As you have written you are interested in engineering: marine, aeronautical and electronics & communication.
All the three streams are totally different forms of engineering.
Marine Engineering deals with technical parts of a ship or cruise. It includes design, development and maintenance of systems which control ships and their components. Both on-shore and off-shore jobs are available. Good job opportunities exist in Navy, shipping companies, ship building companies, ports within India and overseas, etc. Related course is 4-year BE(Marine Engg.) after 10+2.
Aeronautical Engineering is related to research, design, manufacture and maintenance of highly sophisticated products such as aircraft, missiles and space satellites. Job opportunities exist in defence departments, airline companies, ISRO (Indian Space Research Organisation), aircraft manufacturing companies, Civil Aviation Department, etc. Related course is 4-year BE(Aeronautical Engg.) after 10+2.
Electronics & Communication deals with electronic devices and equipments including microprocessors, fibre optics, television, and radio. Job opportunities exist in TeleCom Companies, broadcasting services like tv, radio. Related course is 4-year BE/B.Tech.(Electronics & Communication Engg.).
Eligibility to join any of the above courses is 10+2 with PCM. To get admission into a reputed institution, you will have to clear concerned entrance exams. Diploma and M.Tech. courses are also available in these streams.
Marine and Aeronautics are special areas and their study & implementation is limited to a particular industry. But there are immense job opportunities exist in their respective industries and limited number of skilled engineers available at present so it is little easy to get a job. Remember, there are very few reputed institutions who provide related courses and it is tough to get admission.
However, Electronics & Communication is applied in various areas and industries. Most of the technical institutes offer related courses. But there is high competition exist in jobs.
Final selection of course depends on your choice and preferences. There is no limitation for hardworking and talented students.
Please Note: This answer is just our view and a suggestion only. We have used our best knowledge but still the information may not be 100% accurate and updated.