The students who go to pursue an undergraduate degree in engineering in the USA are awarded with a Bachelors in Science (BS), unlike in India, where engineering graduates are awarded with a Bachelors in Engineering (B.E.) or a Bachelors in Technology (B.Tech).
You can know about the score requirements of a certain university, by mailing the admissions office.
The BS programme in the US is a 4 year course. The course duration for associate degrees like Associate of Science (A.S.) is 2 years. The total expenses incurred by you can be anywhere between US Dollars 10000 to 30000 per year. So, for a 4 year course, it can be from anywhere between US Dollars 40000 to 120000. The expenses vary for different universities. (Know more about the top universities in the US.) There are very few scholarships at the undergraduate level, in the US.
The factors to be kept in mind while short listing a university are:
Bear in mind that the mailing the documents could take about 8-10 days, so do mail the documents accordingly.
You will need to put together a list of documents before going for a visa. These are normally, your I-20 Form, financial documents, Affidavit of Financial Support, Passport, Visa application form, among other things.