yea i agree with what hyeran said... SAT prep academy can help but mostly i believe it is somewhat waste of time. all they do is give out problems and make us to solve everyday... i mean that is practically all we do... so i would recommend that you should buy some books via Amazon and study it instead.
some books that i would recommend are;
Official guide to SAT (a.k.a. the blue book)
James hong SAT critical reading
i wish you luck