Oh kiddo this isn’t going to work
The total cost to attend an US University is $40,000-$70,000 USD per year. And that can easily be higher depend on the university.
There are very few scholarships/grants for international students. Getting some doesn’t mean they are going to cover the total cost of attending. Just a fraction of it. Besides fees, tuition, and text books you will to pay for
Dorm supplies, school supplies, personal expenses, laundry, health insurance (which will NOT cover all your health/medical expenses) transportation to name a few.
Work study, few international students are allowed. You must work on campus for less than 20 per week and your are not guaranteed 20 hours each and every week. Campus jobs go fast.
You would need to apply, be accepted, prove you can pay , then apply for a student visa.
Paying for the SAT exam and for application fees to each US university, for ghost of a chance that will have the funds to attend is wasting money
Check universities in your country that have a study aboard program to an US university.
My daughter spend three months over the summer in the UK. She took three classes at a university there and did some planned tours. And explored by herself