USA

Hi Nirmal,
It depends on a lot of factors like which university you are applying to, the desired programme, your financial situation, career plans, etc. You know that your academic background is not too competitive, but a very exceptional personal statement, essays and recommendation letters will push your application. Your IELTS is low for an MS course, in fact, you should take TOEFL. If the course you want to do demands another test like GRE, you have to take it. After you have submitted the application, the university will send you the offer letter, it depends on the university totally. You can then apply for the visa only after you get the offer letter.

To do B.Tech from USA, you must appear for the SAT (Scholastic Ability Test). Almost all the colleges and universities in USA accept this SAT exam score to enroll students. Therefore the SAT exam score is one of the main eligibility criteria to get admission in USA colleges. This is main reason behind the popularity of this test. The purpose of conducting this exam is to evaluate students for their writing, reading as well as mathematical skills. Paper pattern:
The total duration of the exam is 3 hours and 45 minutes. The SAT exam is divided into SAT Reasoning Test and SAT subject based Test. If you want to take admission in any US college on the basis of SAT reasoning score, it is just not enough to secure a seat in US colleges. But on the other hand, some colleges also consider the score of the subjects based exam. In most of the cases when we say SAT exam, it meant to the SAT reasoning test. You can apply for the SAT from the official site http://sat.collegeboard.org/
The score required for MIT University will be about 2030 2320 out of a maximum 2400. Also you will be required to score 650 760in the critical reading out of 800 and 720 800 out of 800. There are several books which will help you in clearing your SAT exam. Personally I would suggest Barron's SAT preparation book as it is a complete one stop book for all the sections of the SAT and also comes with a CD with practice tests in it. You can find practice papers online on the official site http://sat.collegeboard.org/practice.twice-questions
You can also take classes for the maths and English part of it. If you work hard enough, you can also score full marks in it, though its a rare feat but there are several students around the world who achieve a golden score. Good luck