<p>Many students in the US who have similar qualifications to you do not prepare AT ALL for the SAT and regularly get scores of 2200+. That being said, I’ve noticed that international students often seem to have a more difficult time than US students. Either way, having only a month to prepare should not deter you.
People on this site have an obsession with SAT preparataion. Of the 7 people I know who got into top universities from my school, only one did any SAT prep beyond taking a practice section or two. It’s entirely possible to get a 2200+ with minimal prep (and a month of heavy preparation is waaaaay beyond minimal prep).
One thing I would suggest (this is based on personal/peer experience, NOT what the college board says fyi) is to try and get your essay to be relatively long. You obviously want it to be focused and to the point but it seems that people who are able to write longer, focused essays are the only ones who tend to get that perfect essay score. Oh and try and throw in at least one proper use of a semicolon. </p>
<p>Best of luck!</p>