You have a lot of plans, OP, but as you learned when you took your final exams things don’t always turn out according to plan.
I suggest you do some research and then come back to us with some more specific information. Even saying you’re only interested in prestigious schools, and then combining that with your plans for SAT scores, is too vague for us to be much help.
You might start your research by responding to the questions posted here:
Make sure you speak to your parents about your plans and their ability and willingness to pay full fare at an American college, which can amount to $60,000 each year. Saying “I think they can afford it” is of no help to you. Students are often surprised to learn a) what colleges cost and b) what parents are willing to pay. Talk to them about real dollar amounts they will offer you each year. As @QwertyuiopPro notes, you might find that their response will allow you to stop your search right then and there.
Few American colleges will offer ANY aid to international students; here are some places to look for colleges that will offer some:
http://www.educationusa.info/financial-aid.php
Despite your plans, you simply may not be able to afford an American college.
Your grades and planned SAT scores are not such as to make you likely to get a lot of aid from an American college. There are just too many applicants to prestigious schools with better scores and outstanding extracurriculars. You may find you have to go below the most prestigious colleges in order to get the financial aid you need, and these less prestigious colleges are even less likely to produce all the aid you need. This is what your friends found out, despite their plans.
I am not trying to puncture your plans, but there is a reality to applying to colleges and colleges live only in the real world. It really is time for you to do something to make real your plans.