Retake Test, or Take Another?

<p>Hi.</p>

<p>I’ve recently took several SAT Subject Tests, and got these scores:
Math 800, Chemistry 770, Physics 800</p>

<p>I’m a freshman, and am aiming for schools like CalTech, Swarthmore, or Harvey Mudd.
I think I screwed up my Chem, as I’m thinking of majoring physical chemistry (Pchem).</p>

<p>I’ve already got 5s in both subjects.
Now, should I retake the Chemistry subject test next time, or take Biology after studying AP Bio?</p>

<p>Ah, I wasn’t so confident on Chem but I took’em with Physics so I couldn’t cancel it;;</p>