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MBA admissions in US and other countries is not as straight forward as in India. MBA colleges abroad are much more specific about the job experience and profile requirements. In India you will get an interview call if you have an amazing CAT percentile. But this is not the case in most US Universities.
For MBA abroad the primary step is filling the online application form for college. Apart from that you will need to do the following:
1. Prepare for GMAT and get an amazing score.
2. Do internship and work.
3. Do some research and self development projects. Build something good and useful.
4. Shortlist the colleges you wish to apply to and go to their websites to learn more about their requirements.
5. Get recommendations from your work place. Recommendations from superiors in workplace are very valuable. Recommendations from teachers are not so valuable if you re going for MBA.
6. Check out the essay topics for your target colleges and start thinking what you are going to write.

Kumar sir don't go with which stream is better. Go with what you want do after studying B.Tech. You may take following considerations. If you like computer, want to build crazy application or something related to software go with Computer Science engineering. If you like playing with machines/motors or electricity go ahead with Mechanical engineering. Or Electrical engineering. If you are India, after studying Electronics and communication engineering most of the students gets job/work in IT companies. Only few percent gets chance in electronics companies. So I would suggest, better to study Computer Science 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 mentioned in point # 1, 2 and 3 (Computer Science, Electrical, Mechanical, or Electronics). Best of luck.