Bio Subject Test: PR/Barrons

I have the Bio SAT 2 this Saturday. I have taken the PR tests and have done fairly well on them, scoring 750+. I took two Barron's tests; one 1 I got a 770 and on another I got a 650. Which book has tests closer to the actual SAT 2?</p>

<p>Thanks for the input</p>

<p>i've heard that PR has much more accurate tests, while Barron's is harder..</p>