sat bio and chem after 2-3 years?

<p>I'm an upcoming senior and wanna no if i should take bio and chem subject tests in december. I wanna major in biochem, chem, bioengineering, or chem engineering in college.
I've already taken us history and math 2 subject tests, but wanna show colleges wut I can do in science. I took regular bio in 9th and honors chem in 10th grade and did pretty well on both. I borrowed Kaplan Sat bio and 2 sat chem books (REA and PR) from library, but am afraid there wont be enuf time to study em adequately b4 there due. I've started taking notes on bio but not chem yet, so should I keep going until i have all basic points of both subjects down or just forget about the tests in general?</p>