Should I retake SAT Bio?/How to prepare during the summer?

<p>As a freshman, I took the SAT Bio this June, but I fell short to my expectations, getting a 720. My parents said that I need 760+, so should I retake it? If yes, then how should I prepare for taking it this October, without forgetting crucial material? </p>

<p>(Also, I got a 730 on my World History SAT, which I must have gotten a lot wrong to get that score. I took AP World this year, but I feel like I will forget everything during the summer, so should I retake WH SAT too?)</p>

<p>I'm looking at top 40 colleges to submit to.</p>