most community colleges write their placement tests to be taken cold, as in no studying

if you took up to calc you will be fine as far as material, its just a matter of not missing negative signs and making stupid mistakes

also you can generally enroll in the class above where you placed so that can be useful as well

but the majority of the time students fail the placement test, then bitch to their counselor untill they get into the higher level class they want, then fail the class 3 times and start back at a the correct lower level class 2 years later and are fucked for their entire college career

if you are really concerned then go into the cc and ask them for a practice test or a course outline for an algebra class and look those over, but i really doubt you have anything to worry about, the students i see fail these tests wouldnt be able to figure out how to post on han, so i think you will do fine