first time studying SATs

<p>Ok,so this is my first time studying the SAts/Sat2s.
I really don<code>t know which books to get.
Recently, I bought the official SAT guide from collegeboard(the big blue book) and the Princeton Review</code>s for SAT2 Math/Bio.
But I don<code>t know if this will be sufficient prep, for instance, I heard Kaplan</code>s is much harder, so it might be better prep. </p>

<p>Anyone have any opinons? I don`t want to go out and buy all these books(I live outside the US, so the books cost 1.5 times the original amount)...thanks to all who replied!</p>