CBSE 12th

Admission Process for B.Tech in Marine Engineering:
The candidates can apply for B.Tech Marine Engineering through entrance exams or via direct entry. Most of the institutions take admission through entrance exams. Some institutions like C. V. Raman College of Engineering, Bhubaneswar offer direct entry alongside entrance test. Entrance Mode:
The top exams for B.Tech Marine Engineering are:
Indian Maritime University Common Entrance Test: IMU conducts Common Entrance Test for undergraduate programs in May. HIMT Online Entrance Test: This test is conducted by HIMT across India. IIT Joint Entrance Examination: It is the examination conducted for IIT aspirants. JEE: This exam is conducted in the months of December and January. For Paper 1, students can opt for either pen paper-based exam or online exam. Regards.

If you want to pursue a career in networking then there are two ways to do it:
1. Do specialization in computer networking by doing PG from IISc, IIT, NIT, etc. After completing PG, you will get a chance to work with networking giants like Cisco, Orange, Juniper, etc. Here you can get a chance to work in their R&D department. (Here you work as a researcher).
2. Another way is that you can enter into this field by obtaining vendor certifications like CCNA, CCNP, CCIE (Cisco track) or JNCIA, JNCIP, JNCIE (Juniper track), etc. By following this certification track, you will be able to design, install, configure and troubleshoot small to the large-sized network. This is also a good choice to enter in the networking field. (Most people follow this).
Now, the choice is yours, whether you want to become a researcher in networking field or to become a network professional.
Both ways are good. Ask yourself and decide which path to follow.

Well, I think I can answer your question since I too faced the same scenario years before.I'll try to keep it short and simple.
Image of a Doctor: You can do a lot of social welfare work. You are kind of god wherever you live. You will be in the good book of many people. Respect will follow you everyday everywhere. There is no doubt about it.
Image of an engineer: You will not find respect, you will have to earn it by doing something worthy and extraordinary. You are just an individual. You may or may not get a chance to work directly for the welfare of the people. Chances are less. But let me tell you any social service is worthy of respect and honor. But the medical servants own a little more because they are people who save lives.
Personal life of a doctor: It is hectic, painful and stressful. Imagine yourself fighting death every day and saving lives and sometimes failing which takes a toll on you. It scrapes away your soul unless you are strong hearted. Hospital is not a fun place.You have to have a lot urge in you to become a doctor and must be willing to sacrifice your fun, pleasure many a time. As for the money, you will start earning at a later age and can keep earning until your old age. You have to be a lot more studious, diligent and hard working.
Personal life of an engineer: It is all fun & pleasure and doesn't have to be under a Damocles sword all the time. You know your negligence or failure won't be taking a life. Besides engineering life is very enjoyable. You can give time to your family.You will be capable of earning early of the age and can also earn at par with a doctor.
PS: I have written all these keeping in view you don't waste your life in either case and I have judged from a common platform.
Besides, you must understand yourself what you want and what you are willing to sacrifice whatever the cost.