There is no financial aid for international students at Berkeley (or any of the UCs, or CalStates)
From your post you have a lot of homework to do on US universities and colleges, and you need to start with money. First, figure out what you can actually afford to pay. There are 2 types of financial aid: merit and need.
For need-based aid, try running the ‘net price calculator’ (NPC) for colleges that you are interested in (it’s on the website). The results are variable, but it’s a start. The website for each college/university will also say what their policy is on financial aid for international students. A few will say that they “meet need”, which means that you give them all your financial information and they run their NPC and tell you how much they think that you can afford. Most will say that they are ‘need aware’, which means that they will consider whether you need financial aid when deciding whether to offer you a place.
There are also ‘merit’ scholarships, which colleges/universities use to encourage students with strong test scores to come there. These range a lot, from a few thousand dollars to full rides- but to get them you typically have either meet specific scores (University of Alabama-Huntsville, for example), or have scores in the top 10% or so of admitted students. There are also ‘named’ scholarships which also range from small to full pay- but the full pay ones tend to be very competitive. Again, policies on eligibility for international students varies considerably, so you need to check the websites.
One more thing: you said that you got a 1500 on the (now old version) SAT, and that was ‘average’. That was an ‘average’ overall in the US, but for Stanford 80+% of the class had more than a 2100. It is true that really strong international applicants can get into top colleges with lower SAT scores- but they typically have something amazing to offset it. The SAT has just be revised and is now scored out of 1600 (instead of 2400), and if you are looking at top schools I would suggest looking for a score over 1400.