<p>I also think that not having a “12th grade” may have made your application less desirable.
(Katliamom: Sixth form is a 2-year program for AS and A2 exams, which together make the 1 Levels. Sixth form = 11th+12th grade).
You should email a lot of universities that interest you, asking what credentials they need from Russian candidates: 11th class credentials with secondary school graduation, or an additional year?
(I know that in some provincial systems that have 11 years in India, they request one extra year).
If an additional year is needed and money is not an issue, then going the Sixth Form route would make sense, as long as you take 3 “solid” A-Level subjects (plus a 4th one for enjoyment, like Media Studies, which is actually quite interesting). However you could also try to get into an American high school - I know in Maine some public high schools take fee-paying students even late in the year. This way you’d be in the US and you’d complete your “missing” 12th grade, you could take a bunch of AP classes, you’d retake the SAT, you’d continue your involvement in ECs, and you’d be able to diversify your applications - one problem is that your college list was reach-heavy, and “wild card” colleges at that, ie schools no one even the perfect applicant can be sure to get into.
This school is looking for Chinese students, but why not Russian? Plus if you apply to the South, West, and Midwest, you’ll provide geographical diversity in addition to international diversity 
<a href=“Millinocket, Me., High School Recruits in China - The New York Times”>Millinocket, Me., High School Recruits in China - The New York Times;
This school does the same and has welcomed Russian students:
<a href=“Tiny Newcomb, N.Y., Recruits Students Worldwide - The New York Times”>Tiny Newcomb, N.Y., Recruits Students Worldwide - The New York Times;
<p>I don’t think Rutgers would be a good match for you based on what you said about yourself and your skills. However, since you don’t need financial aid, you could go to Rutgers and try to transfer for your Spring semester or for next year.</p>