Polytechnic

Of course, going for polytechnic is good if you want to be technically strong than those who are joining engineering after 12th. After joining poly you will be technically sound already as conpared to fresher students coming from 12th. Those who are coming by doing 12th will lack knowledge as compared to you. The 2nd important thing is you will not have to go for entrance exam while applying for engineering. Sometimes, it is problematic to score in entrance and get good college. So, you will be on safer side if you go for Polytechnic. If you want to apply for college like NIT and IIT then you have to for 12th and entrance exam which is again hectic. Choice is yours. Best of luck.

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