GATE

Dear Aspirant,
Both the exams GATE & ESE are very prestigious exams in India and possess the capability to fulfill ones dreams and aspirations. GATE is conducted by IISC, Bangalore & 7 IITs while ESE is conducted by UPSC. GATE exam generally leads you towards higher studies from very prestigious institutes of India & Abroad and its a GATEWAY to enter into the PSUs. ESE Exams gives you an opportunity to make your career in central government. Jobs in many Engineering Departments. Coming to the core of the question it is very important to analyze different aspects of both the exams very carefully before reaching to any conclusion. I can get an impression from the question that you are a college going student and I will try to give you a solution considering the same fact. Till the time you are in college campus you are in a much secured environment but once you are out of the college without a job or any concrete career plan, things will become very difficult for you; this is the reason that you have to take this decision very carefully to avoid any difficult & uncertain situation just after graduation. It is suggested that you should appear for both the exams in the same year with full preparation but the first priority should be GATE Exam. With right strategy & preparation you can get a job in any of the reputed PSUs through GATE. This will relieve pressure from you regarding your future as you will have a secured job and at the same to time you will be able to make justice with ESE preparation. If you will research on the background the people who have qualified ESE with flying colors, they have followed the same procedure; they get selected in any of the reputed PSUs, go on medical leave for around 6 months and utilize this time to yield best results in ESE Exam. Hope, I have been able to answer your query. Chase your Dreams. All the best

Don't go with which stream is better. Go with what you want to do after studying B.Tech. You may take the following considerations. If you like a computer, want to build crazy applications or something related to software go with Computer Science and Engineering. If you like playing with machines/motors or electricity go ahead with Mechanical engineering or electrical engineering. After studying electronics and communication engineering most of the students gets job/work in IT companies. Only a few get a chance in electronics companies. So, I would suggest better to study Computer Science and Engineering. If you want to sail through vast sea go with marine engineering. If you have not decided what you want to do after B.Tech, sit for one or two days and decided what you want to do. If still confused, select any of the engineering branches mentioned in point # 1, 2 and 3 (Computer Science, Electrical, Mechanical, or Electronics).
Best of luck.