Should I take subject tests?

<p>I want to take Math 2 and Physics, maybe Biology M
I’m applying to all the UC’s (aiming for Davis, Irvine, Santa Barbara)
I’ve taken ACT with writing expecting 30 composite, 6 writing
I can get a fee waiver so I pay zero to take it
I have not studied for them at all, but I took regular physics and taking calculus</p>

<p>Also, what happens if I get like 500 on them, would that hurt my chances more than not taking them?</p>