Hi,

For the study in USA after 12th the requirements for getting a Bachaler's degree in USA is different.

To be eligible for admission to a U.S. university, you must meet certain minimum entry requirements. These include a secondary school diploma or examination results, English language ability, and in many cases a score from one of the U.S. university admissions tests.
Most U.S. universities expect international students to have a secondary school diploma or secondary school examination results that would enable them to attend a university in their home country. This is particularly true of the most competitive universities, which look for students with high grades (among other things). However, remember that there is a wide range of admission standards and acceptance rates among U.S. universities and colleges. Since the U.S. system of education places great emphasis on breadth of knowledge, it is also important that your secondary school study has included a variety of subjects such as English, mathematics, natural sciences (physics, chemistry, and/or biology), humanities or social sciences (history, geography, economics, politics, or similar subjects), and a foreign language. Lastly, universities will not usually accept international students who are younger than age 17.
In addition, you need to take TOEFL and SAT.

Hope this helps.