How difficult are the SAT II's for biology and math level II

<p>Hey,</p>

<p>So, I’m taking the SAT II in Math Level II and Biology in May 2011, so like a month from now. I’ve been preparing using the Barron’s prep books, but I want to know how difficult the SAT II’s actually are. If I do 20 practice questions per day for biology and 20 questions for math level II, will I be prepared for the tests? I’m really worried about them. I took a practice SAT II for Biology M and got a 570, and I took a practice test for Math and got a 650. </p>

<p>Please advise, and thank you in advance :)</p>