should i retake chem?

<p>i took the SATIIs in june, and got 770 in chem. (math 800 physics 800)
i am very good at chem and got 800s on practice tests. and i am applying to some top tier schools and will probably be majoring in chemical engineering.
it's a very competitive test and lots of people got 800s.
so should i retake the test and get an 800?
will the schools i am applying notice that i've been taking the test twice, if i am not sending the first score?
if they do know, will it be against me? </p>

<p>thank you.</p>

<p>look at their policies on their websites. some require every single score to be sent.</p>

<p>^but is 770 a good score, or is it mediocre, or even will it act against me. i heard it’s smart to send three SATIIs to schools only requesting two scores.</p>