PSAT compared with SAT?

<p>I'm preparing for the PSAT. Since the PSAT is so similar to the SAT, should I study Barron's PSAT book with 1300 vocab words (i think), or would I be building a stronger vocabulary (in terms of the PSAT) if i study Barron's SAT book with 3500 vocab words?</p>

<p>I'm only a freshman, and i have a lot of time to do either for now. What should i do? And any other tips for preparing for the PSAT would be very appreciated.</p>