When should I take my SAT 2 Biology?

<p>I haven't even looked at a biology subject since freshman year (when I had the class). And I am debating whether I want to be a biology major or not at one of the UCs and some require that I take the sat 2 for biology.</p>

<p>When should I take it? Would I be able to take it after I take ap bio senior year or do I have to take it before my applications are turned in?
If I have to do it early, how should I study for it since I don't remember much of anything?</p>